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Black 80% Lowers Fire/Safe Engraved (3-Count)
$233.95(You Save $53.96)Black 80% Lowers Fire/Safe Engraved (3-Count)
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Premium Black 80% Lower Billet Fire/Safe Engraved (1-Count)
$129.95(You Save $49.96)Premium Black 80% Lower Billet Fire/Safe Engraved (1-Count)
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Black 80% Lower Fire/Safe Engraved (1-Count)
$77.95(You Save $17.96)Black 80% Lower Fire/Safe Engraved (1-Count)
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Easy Jig Gen 2 with Tooling (AR15/AR9)
$249.99(You Save $30.00)Easy Jig Gen 2 with Tooling (AR15/AR9)
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The Ultimate AR15 Build Kit
$1,784.95(You Save $214.95)The Ultimate AR15 Build Kit
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300 Blackout Build Kit (16″ Barrel and MLOK Handguard) with AR15 Fire/Safe 80% Lower
$650.00(You Save $150.00)300 Blackout Build Kit (16″ Barrel and MLOK Handguard) with AR15 Fire/Safe 80% Lower
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5D Tactical Router Jig PRO Multi Platform & Premium Black 80% Lower Billet Fire/Safe Engraved (3-Count)
$779.90(You Save $284.95)5D Tactical Router Jig PRO Multi Platform & Premium Black 80% Lower Billet Fire/Safe Engraved (3-Count)
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9mm AR-9 80% Billet Lower (5-pack)
$950.00(You Save $210.00)9mm AR-9 80% Billet Lower (5-pack)
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AR15 Build Kit – .223 Wylde (16″ Stainless Barrel, 1:7 Twist & 13.5″ MLOK Handguard) with Fire/Safe Marked 80% Lower
$999.95(You Save $499.95)AR15 Build Kit – .223 Wylde (16″ Stainless Barrel, 1:7 Twist & 13.5″ MLOK Handguard) with Fire/Safe Marked 80% Lower
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AR15 Build Kit – .223 Wylde (16″ Barrel & 12″ M-Lok Handguard) with Fire/Safe Marked 80% Lower
$999.95(You Save $499.95)AR15 Build Kit – .223 Wylde (16″ Barrel & 12″ M-Lok Handguard) with Fire/Safe Marked 80% Lower
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Polymer80 Compact Frame and Jig Kit (Glock 19/23, gen 3)
$200.00(You Save $40.00)Polymer80 Compact Frame and Jig Kit (Glock 19/23, gen 3)
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The Patriot Pack – 80% Lower Combo
$402.85(You Save $112.86)The Patriot Pack – 80% Lower Combo
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Building an AR-15 from an 80% Lower Receiver with our 80% Lower Jig
Our AR-15 80% Lower Jig Assembly gives you the definitive guide when it comes to taking on an 80% lower yourself. Constructed of 6061 aerospace grade aluminum and prepared in our state of the art HAAS CNC machines and held to the strictest of tolerances, we have manufactured our 80% lower jig assembly to be used by anyone wanting to finish their own 80% lower. Featuring clearly marked dimensions and this online step by step guide, we are here for you every step of the way by offering our no cost live phone support should you need it. This 80% lower jig works for almost any milspec 80% lower receiver.
- Patent Pending Design
- 6061 Aerospace Grade Aluminum
- Online Step by Step Guide
- No Cost Live Phone Support
- No FFL Required
- Protected by The 1968 Gun Control Act
- Made in USA
- MSRP $ 130.00
Our AR-15 80% Lower Jig Assembly is designed to fit any milspec lower as well as numerous variants from other manufactures. Since we cannot buy every single lower out there, we do not maintain a list or guarantee they will work with all of the others out there. Because of our patent pending design used to locate off the rear take down pin we are able to locate on nearly any lower receiver. This jig will not fit lowers with fixed trigger guards without modification. Our 80% lower receiver jig assembly can be used on multiple lowers if used properly, but may require slight modification when selecting a variant manufacturer’s product.
How to complete an 80% Lower using the Vision Defense 80% Lower Jig.
Welcome to AR-15 80% lower finishing 101… What follows is an “instruction guide” for demonstrating how to use our AR-15 80% lower receiver and 80% lower jig. This does not mean there are not better or safer ways to finish one. If you think of a better solution and have some free time. Write it up and send it to us so we can post it here for others to read as well.
So Let’s Begin –
STEP 1-A
The first step is to obviously gather all the required tools necessary so we are not stopping in the middle of our project. The recommended tools for this project are listed below.
- (1) 5/32 Jobber Drill Bit
- (1) 3/8″ Jobber Drill Bit
- (1) 5/16″ Jobber Drill Bit
- (1) 3/8″ x 1-1/4″ Center Cutting Endmill
- Drill Press or other capable equipment
- X/Y Cross Slide Vise
- Optional (1) Dremel with 1/4″ Grinding Head
Okay, once you have all of the above around, we can begin. To get started we will need to assemble the 80% Lower Jig around your first 80% Lower Receiver. Attached the Side Plate (A) and Side Plate (B) and use the boss on each to locate the jig in the rear takedown pin hole towards the rear of the lower. Then install Top Plate (C) over the top edges of both of the side plates. Assemble the 80% lower jig “loosely” until you are able to insert all of the (4) top plate assembly bolts and the side plate cross bolt and spacer.
- Top Plate (C) is clearly marked “1-1/4 deep”, The 80% Lower Jig provides you the outline or profile you will need to follow to make your cuts at that depth. The dimension is 1-1/4″ deep from the time you touch the material, so set your stop on your press accordingly when you are setting up your jig.
- We suggest setting up with the 3/8″ Jobber Drill and drilling 1-1/4″ deep in every corner radius of Top Plate (C). This will make it easier when you switch to the 3/8″ x 1-1/4 Center Curring End Mill later on. Below is a simple picture diagram of our suggested drilling locations for this step.
Step 1-B
- Now after Step 1-A you should have a of minimum (5) holes protruding into your 80% Lower in the locations pictured above. The next task is to remove as much material inside of the remaining profile as possible with the 3/8″ drill. *Make sure you are not overlapping the holes with the drill, overlapping the holes will wear the drill and possibly break it.
- Now we are switching to the 3/8″ x 1-1/4″ center cutting endmill. After the completion of steps 1-A and 1-B you should have created a “web” system in the center of the lower. Now you are going to use the center cutting endmill to plunge into the center of those “webs” to remove the remaining material. *The depth of the endmill cutting should not exceed 1-1/4″ deep as this is the finished depth of the pocket while utilizing “Top Plate C”
Step 3
- Now that you have removed all of the material in the lower fire control group of your 80% lower receiver. It is now time to switch the top plates. Begin by removing (Top Plate C) and replacing it with (Top Plate D)
- You will notice that just like Top Plate C, the replacement top plate also has profiles with the depth of cut marked out for you.
- Just as before you are going to drill as many holes as possible in the rear profile (near the buffer tower) of Top Plate D. We have recommended the (3) locations in which we chose to drill our holes.
- Now, You guessed it! We are going to bust out that 3/8″ center cutting endmill again and remove the “webs” and remaining material in the rear portion of Top Plate D.
Step 4
- Since we have Top Plate D installed, we can go a head and take care of the front portion of that plate now. This portion will drill the location holes for the trigger slot in the bottom of the fire control group pocket.
- What you’re going to do is, while using the 5/16″ Jobber Drill you are going to drill (1) hole at each end of the slot in Top Plate D, and then a final hole right in the center of the slot. This will allow you to clean up any remaining “web” created by the drills with the 1/4″ dremel we mentioned at the beginning of this post. *You can also use a 5/16″ center cutting endmill if you have one available.
Step 5
- Now lets move to the side plates and get this thing wrapped up. This process is pretty straight forward. We DO NOT recommend drilling all the way through from one side. The chances of the drill “walk” is very high and could render the 80% lower receiver and all of your hard work useless.
- With the lower and jig on it’s side you will see your (2) trigger pin holes are ready to be drilled. These holes use a 5/32″ Jobber Drill to fit your hammer and trigger pins correctly. Drill through halfway into the cavity you created at the beginning of this post.
- The other hole marked for a 3/8″ Jobber Drill is for your safety selector. Drill halfway through from each side, then all the way through from one side to align the holes correctly.
Step 6
- That is it! You’re done! Now all you may need to do is “clean up” the finish on the inside and straighten out your cuts. This is where the X/Y vise and the center cutting endmills come in handy. But you can use a dremel or other type of equipment to clean it up.
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- AR-10/LR 308
- AR-15
- AR-10/LR 308
- AR-15
Description
The JT-15 Lower Receiver in 80% completed form. The JT-15 is precision CNC-machined from solid aerospace billet aluminum. It is not a cheap forging. This is a top-tier AR-15 lower receiver perfect for any high quality AR-15 build.
• JUGGERNAUT TACTICAL applies its own Cerakote: ceramic-based thermoset epoxy finish in 4 color selections, which include Magpul FDE, Sniper Grey, Magpul OD Green, and Burnt Bronze.
• The non-Cerakote finish options include Black Anodized and Pink Anodized.
• T6 Heat-Treated 6061 Billet Aluminum
• Completed weight: 8 ounces
• Integral winter trigger-guard for added strength
• Flared magwell to improve mag changes.
• Laser engraved JTAC logo
• Broached magwell
• Threaded bolt catch
• Upper tensioning screw
• Bolt catch assembly screw
• No roll pins need for assembly
• Ambi Bolt Release/hardware
• Lifetime warranty against manufacture defects
• Threaded rear takedown pin
• Semi safe engraved on both sides
If you would like to finish your JT-15 80% Lower at home, we offer a jig-kit here. Because 80% Lowers are not considered firearms by ATF, we can ship them right to your front door with no FFL required.. but finished rifles must meet all applicable laws and you must be able to legally own a firearm. Compliance with all laws is YOUR responsibility.
The JT-15 Lower Receiver in 80% completed form. The JT-15 is precision CNC-machined from solid aerospace billet aluminum. It is not a cheap forging. This is a top-tier AR-15 lower receiver perfect for any high quality AR-15 build. • JUGGERNAUT TACTICAL applies its own Cerakote: ceramic-based thermoset epoxy finish in 4 color selections, which include Magpul FDE, Sniper Grey, Magpul OD Green, and Burnt Bronze.
• The non-Cerakote finish options include Black Anodized and Pink Anodized.
• T6 Heat-Treated 6061 Billet Aluminum
• Completed weight: 8 ounces
• Integral winter trigger-guard for added strength
• Flared magwell to improve mag changes.
• Laser engraved JTAC logo
• Broached magwell
• Threaded bolt catch
• Upper tensioning screw
• Bolt catch assembly screw
• No roll pins need for assembly
• Ambi Bolt Release/hardware
• Lifetime warranty against manufacture defects
• Threaded rear takedown pin
• Semi safe engraved on both sides
If you would like to finish your JT-15 80% Lower at home, we offer a jig-kit here. Because 80% Lowers are not considered firearms by ATF, we can ship them right to your front door with no FFL required.. but finished rifles must meet all applicable laws and you must be able to legally own a firearm. Compliance with all laws is YOUR responsibility.
• JUGGERNAUT TACTICAL applies its own Cerakote: ceramic-based thermoset epoxy finish in 4 color selections, which include Magpul FDE, Sniper Grey, Magpul OD Green, and Burnt Bronze.
• The non-Cerakote finish options include Black Anodized and Pink Anodized.
• T6 Heat-Treated 6061 Billet Aluminum
• Completed weight: 8 ounces
• Integral winter trigger-guard for added strength
• Flared magwell to improve mag changes.
• Laser engraved JTAC logo
• Broached magwell
• Threaded bolt catch
• Upper tensioning screw
• Bolt catch assembly screw
• No roll pins need for assembly
• Ambi Bolt Release/hardware
• Lifetime warranty against manufacture defects
Ar-15 80% Lower Receiver Polymer
• Threaded rear takedown pin• Semi safe engraved on both sides
If you would like to finish your JT-15 80% Lower at home, we offer a jig-kit here. Because 80% Lowers are not considered firearms by ATF, we can ship them right to your front door with no FFL required.. but finished rifles must meet all applicable laws and you must be able to legally own a firearm. Compliance with all laws is YOUR responsibility.</p>','retail_price':13000,'meta_title':null,'meta_description':null,'slug':null,'visible_for_retail_customers':true,'ffl_required':0,'weight':'1.00','created_at':'2017-02-01 04:58:30','updated_at':'2017-02-01 05:02:55','deleted_at':null,'price':'130.00','selectable_attributes':[{'id':16,'product_id':8,'name':'Type of finish','created_at':'2017-02-01 05:00:58','updated_at':'2017-02-01 05:00:58','deleted_at':null,'options':[{'id':43,'attribute_id':16,'name':'Raw','retail_price':0,'created_at':'2017-02-01 05:01:07','updated_at':'2017-02-01 05:01:07','deleted_at':null,'price':'0.00','prices':[{'id':96,'pricing_level_id':2,'priceable_id':43,'priceable_type':'AppModelsSelectableAttributeOption','price':0,'created_at':'2017-02-01 05:01:07','updated_at':'2017-02-01 05:01:07','deleted_at':null},{'id':97,'pricing_level_id':1,'priceable_id':43,'priceable_type':'AppModelsSelectableAttributeOption','price':0,'created_at':'2017-02-01 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- AR10/AR15Lowers
80% Lowers are the latest trend among AR-15 enthusiasts. This unfinished receiver is low on price and helps the user avoid some legal formalities while enjoying the fact that he’s machining the receiver himself.
Here we’ll be talking about what an 80% lower receiver is, how much work and effort is required to customize it and the legal requirements associated with. We will also discuss some factors important to consider before buying. To help you out with this task, this article also outlines some of the best options currently available in the market.
Comparison Chart of the Best 80% Lower Receivers
PRODUCT | DETAILS | |
---|---|---|
Our Top Pick | Brownells AR-15 80% Lower Receiver |
|
Matrix Arms AR-15 80% Lower Receiver Forged |
| |
James Madison Tactical AR-15 80% Polymer Gen 2 |
| |
Polymer80 AR-15 80% Polymer Lower Receiver and Jig Kit |
| |
Anderson Manufacturing AR-15 80% Lower Receiver |
|
What is an 80% Lower Receiver?
An 80% lower receiver is nothing but a simple milled or forged piece of metal which looks like an AR-15 lower receiver but without the fire control group cavity. In simpler terms, it is an unfinished AR-15 lower receiver which requires the user to do some milling and drilling in order to make it functional.
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The part where the trigger assembly is installed is plain solid, and the user must drill and machine this part to convert it into a stripped lower receiver.
Legally, a lower receiver is considered to be a firearm itself and hence required to bear a serial number. That is because a lower receiver houses the fire control group and connects all the basic functioning parts of a rifle.
Due to its unfinished design, this is not considered a firearm by the ATF. This means that it does not require a serial number for sale and purchase. A rifle made with such a receiver can be owned and used in the state, county or city you reside in without any serial number, at least under federal law.
On the other hand, the ATF does recommend users of such self-made AR-15 rifles to engrave some serial number and info on such receivers. This helps in case such firearms are lost or stolen. (We’ll try to stay apolitical for the purposes of our article here).
It is important to note here that an 80% lower receiver is not considered a firearm only if used for personal use. If you finish this receiver for a weapon to be sold or lawfully transferred in the future, it must bear a serial number in accordance with 27 CFR 478.92 regulations. You should also always check with your local firearm laws and regulations beforehand.
Legal Requirements for Registration
Legally, an 80% lower receiver does not have to be registered or have a serial number. They can be sold to anyone with or without an FFL. A person who buys an one can machine and drill it to make a complete lower receiver and hence a complete AR-15 rifle.
Such weapons do not require to have a serial number under federal law. Be sure to be aware of your own state’s laws (looking at you, Californians!).
However, the user can neither transfer nor sell this firearm. If the user intends to sell or transfer such an AR-15 he/she has to get their weapon registered and serialized.
The laws about sale and transfer are somewhat confusing. That’s because you can gift such a weapon to someone if you manufactured it for your own use. On the contrary, if you manufactured such a weapon with the intent of gifting it, you must be sure it's serialized.
The catch here is how is somebody (from the law) going to prove your intention. Confusing, isn’t it?
None of this is legal advice; we’re only presenting our own understanding of the law. Local laws can vary as well.
Factors to Look For
There are several factors you must consider seriously before choosing an 80% lower receiver for customization. These include:
Material
The first and foremost factor to consider when choosing an 80 lower is the material. Lower receivers are generally made either of aluminum or polymer.
Aluminum can be further divided into 6061-T6 and 7075-T6 variants, where the former is more like a general-purpose material and the latter is of high quality and more durable.
Aluminum lowers, being pure metal, are a bit difficult to mill and drill. Polymers on the other hand are softer and require less effort for customization.
But on the contrary, aluminum is long-lasting and more durable than polymer. We recommend using aluminum lowers but it is still a matter of personal discretion.
Finish
80% lowers are generally type II or type III hardcoat anodized which makes them abrasion- and corrosion-resistant. Several lowers bear different kinds of finish such as cerakote and duracoat.
Buying an anodized 80% lower might not be an intelligent choice. That’s because you’ll be milling and drilling the receiver to customize it, which is eventually going to expose the inner layers of the metal which are not anodized.
This means you’ll have to get the lower receiver anodized after finishing it. So it’s better to stay with the non-anodized or simple aluminum 80% lowers.
On the other hand, polymer receivers don’t face such an issue because you are only exposing layers of the same material while machining.
Brand
Always aim to buy an 80% lower receiver from a well-known manufacturer or a trusted firearms dealer.
80% lowers are required to be drilled and machined for completion, so they must have tight tolerances and precise working points.
Low-grade manufacturers can deliver hit-or-miss products which can eventually lead you into trouble while finishing.
Aesthetics
You want your weapon to look good, right? Aesthetics are also an important aspect while choosing an unfinished lower for customization.
Consider the color, design and any engravings on the 80% lower that matches your aesthetic needs.
These are our recommendations for the best AR-15 80% lowers:
Best AR-15 80% Lower Receivers
Let’s look at a few of the top models that meet our criteria for a quality piece you can build your own rifle around.
This is a good 80% lower receiver branded for the renowned dealer Brownells. This lower has been machined from 7075-T6 forged aluminum and comes equipped with a takedown lug pocket.
The broached magazine well helps in changing mags conveniently upon completion of this receiver. The receiver is compatible with a wide range of jigs so you don’t need to buy a new jig if you already have one.
The receiver is multi-cal and will fit any standard AR-15 Upper Receiver. It is available in hardcoat anodized and non-anodized variants so you may choose the one you like.
This version made from billet aluminum is fairly priced and bears the trust of a renowned brand.
The broached magazine well helps in changing mags conveniently upon completion of this receiver. The receiver is compatible with a wide range of jigs so you don’t need to buy a new jig if you already have one.
The receiver is multi-cal and will fit any standard AR-15 Upper Receiver. It is available in hardcoat anodized and non-anodized variants so you may choose the one you like.
This version made from billet aluminum is fairly priced and bears the trust of a renowned brand.
Runner-up:
Matrix Arms AR-15 80% Lower Receiver Forged
This 80% lower receiver has been machined from 7075-T6 forged aluminum and gives the user a chance to machine out the interior pocket themselves.
All the exterior machining has already been done and the user only needs to machine the hammer and trigger pocket for completion.
This receiver supports 5.56 NATO cartridge and is compatible with all standard AR-15 uppers. It’s available in hard coat anodized black and non-anodized variants.
The receiver is black in color and looks aesthetically pleasing. It also features a takedown lug pocket which allows the user to take on an advanced AR build.
All the exterior machining has already been done and the user only needs to machine the hammer and trigger pocket for completion.
This receiver supports 5.56 NATO cartridge and is compatible with all standard AR-15 uppers. It’s available in hard coat anodized black and non-anodized variants.
The receiver is black in color and looks aesthetically pleasing. It also features a takedown lug pocket which allows the user to take on an advanced AR build.
Manufactured from high-grade polymer, this Gen 2 80% lower receiver from James Madison Tactical is easy to customize and install. This receiver is fairly priced as a polymer lower.
Ar-15 80 Lower Receiver Finishing Jig
Machined to perfectly fit all AR-15 parts, the receiver features pre-machined areas such as buffer tube threads, the bolt release cavity and the rear pivot pin. The receiver includes a trigger guard as well.
Compared to other polymer lowers, this one is extremely durable and in some cases comparable with an aluminum receiver. This is a multi-cal lower receiver fit for most uppers of the AR-15 platform.
Just be sure to customize it properly as the manufacturer doesn’t accept returns after any changes to the product!
4. Polymer80 AR-15 80% Polymer Lower Receiver and Jig Kit
Polymer80 offers this polymer 80% lower receiver offers the best value for the money. The package includes an unfinished lower receiver along with a jig kit which makes customization a breeze.
The jig kit also includes the necessary end mill bits and other components so you don’t have to gather tools and resources.
Available in black, flat dark earth, and gray colors, this model offers multiple options to help you with the aesthetics of your rifle. It’s compatible with .223 REM and 5.56 NATO ammunition.
The jig kit also includes the necessary end mill bits and other components so you don’t have to gather tools and resources.
Available in black, flat dark earth, and gray colors, this model offers multiple options to help you with the aesthetics of your rifle. It’s compatible with .223 REM and 5.56 NATO ammunition.
5. Anderson Manufacturing AR-15 80% Lower Receiver
Anderson Manufacturing creates this unfinished lower receiver machined from forged 7075-T6 aluminum for improved durability and performance. The receiver is incredibly low on price respective to its quality.
Operations left to be completed include the fire control group milling, trigger and hammer pins, and the safety selector hole. The receiver is multi-cal when finished and offers extensive customization options to the user.
This receiver has been designed to mil-spec standards and is made in the USA, so you can be sure of the quality. A jig is not included in the package so you’ll have to buy or arrange for it separately.
Some users have complaints with the Anderson Jig so you might consider looking elsewhere.
This receiver is perfect to create a rifle for tactical uses and target practice.
Operations left to be completed include the fire control group milling, trigger and hammer pins, and the safety selector hole. The receiver is multi-cal when finished and offers extensive customization options to the user.
This receiver has been designed to mil-spec standards and is made in the USA, so you can be sure of the quality. A jig is not included in the package so you’ll have to buy or arrange for it separately.
Some users have complaints with the Anderson Jig so you might consider looking elsewhere.
This receiver is perfect to create a rifle for tactical uses and target practice.
How Much Work is Involved to Install an 80% Lower?
Frankly speaking, 80% lowers are specifically for serious DIYers. If you love machining and are ready to put in some skills and effort, you ought to invest in one so you can have real satisfaction knowing the extent you went to in building your rifle.
Converting this piece of metal into the receiver you want can be done using a variety of different methods and tools. There are a ton of videos out there on the internet to help you out with this.
You can finish this project easily and economically if you have a manual end mill or a drill press. If you have a precision jig, this process will get easier. You can find a good precision jig online at many stores.
If you are working with aluminum lowers, the process will be a bit time-consuming and difficult compared to working with polymers. The reason is obviously the difference in the hardness of these materials.
The time and effort to complete a task like this depends upon the tools you use (manual or automatic) and your skills.
How to Install an 80% Lower:
Installing an 80% lower on your AR-15 is affordable and fun, but requires a good bit of work, so carefully follow the steps below and reference our video for assistance:
- Start with the magazine catch. Use a lower vise block to hold it in place. Locate your magazine release spring, place it into the hole, and cover it with the magazine release button, serrated side up. Press in and flip your receiver over and start threading. Be sure the catch won’t scrape against the receiver.
- Move on to the trigger guard assembly. Find the longer roll pin and trigger guard, and depress the pin closest to the magazine well. Now, slip it in, ensuring everything is lined up, and use either a hammer or your fingers.
- Gather your bolt catch assembly parts and place the spring on the plunger and drop it in the hole above your magazine latch. Depress the catch, using a hammer if need be.
- Moving back to the trigger guard, attach the springs. Place the wide side down onto the trigger so the spring stays in position while you place the disconnector on the spring. Press down, and you’ll see the trigger hole. You’ll place this assembly onto the receiver and put a pin through this hole.
- Place your assembly so the trigger will go through the receiver’s oval bottom. Match everything up so you can see the pinhole.
- Check the hammer and spring placement. Once the trigger pin is halfway through, cock the hammer down to ease the pressure. A brass punch may make this step easier.
Important: Do not dry fire! You’ll damage the lower receiver if you do. - Cock the hammer and insert the safety selector. Set position to “fire,” and place the safety detent into the hole opposite the safety indicator. Place the safety detent spring in the hole of the grip. Match the spring to the safety selector hole, ensuring it is still in “fire” position, and screw in the grip.
- Install your rear takedown pin, placing the detent in back of your receiver, and insert the detent spring.
- Place the buffer retainer and spring into the hole and screw in the castle nut.
- Put the end plate into the correct orientation and screw in the buffer tube, stopping before the tube reaches the retainer.
- Match the end plate with the receiver, screw in the last castle nut, and place the detent spring in first, followed by the detent, and lastly by the pivot pin.
- Insert the buffer spring and slide on the stock. Pull your adjustment tab and move the stock inwards. You’re done!
Conclusion
An 80% lower receiver lacks the fire control group cavity which has to be drilled and machined in order to make it operational. They allow users to customize their AR-15 the way they want. Factors such as material, finish, brand and aesthetics should be considered before buying.
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