Some people love classic things. Some of those classic-loving people love classic firearms. You know the type. They can list every good thing about the 1911 in alphabetical order, or tell ya all about how the M-16 used to "jam like a sumbitch." They might even have personal experience on the matter. If you're the type, you'll love this build kit, because it'll get ya an AR with that old-school M4 with the A2 parts on it.
This build kit'll get you everything you need to end up with a fully functional rifle reminiscent of an earlier time. If you happen to track down some of the old-school metal G.I. mags for it, even better. All you'll need is a backup rear sight, and/or the optic of your choice. Everything about this kit screams “mil-spec,” except for the barrel treatment: We ditched chrome lining in favor of a full nitride / QPQ treatment to provide even more accuracy and better protection against the elements.
Barrel Features & Specs:
- Barrel Length: 16”
- Gas System: Carbine
- Barrel Profile: Government
- Steel: 4150 CMV
- Barrel Finish: Nitride / QPQ
- Chrome Lining: None
- Muzzle Thread: ½-28
- Chamber: 5.56 NATO
- Twist Rate: 1:7
- Barrel Extension: M4 Feed Ramps
- Diameter at Gas Block: .750
- Gas Block Type: F-Marked FSB
- Muzzle Device: A2 Flash Hider
Upper Receiver Features & Specs:
- Receiver Material: Forged 7075-T6
- Receiver Type: Flattop M4
- Handguard Type: A2/Heat Dissipator
- Bolt Carrier Group Included: Yes
- Bolt Steel: 9130
- Bolt Carrier Profile: Full-Auto (M16)
- Charging Handle Included: Yes
Build Kit Benefits
- 100% legal to own and ship to your front door
- Not considered a firearm – no FFL paperwork needed!
- 4150 CMV barrel and Classic LPK provides MOA accuracy
- Prebuilt upper ships ready to fire (test-fired for reliability)
- Includes optional forged or billet 80% lower receiver
AR 15 Rifle Kit Details (Expanded):
Barrel: 16″ mid-length, 4150 CMV steel with nitride / QPQ treatment, chambered in 5.56 NATO, 1:7 twist rate, classic A2 front sight post/gas block, carbine A2 handguard, A2 “birdcage” flash hider.
Upper Receiver Assembly: Forged from 7075 T6 aluminum, Type III hard-coat anodized in black for durability. Features M4 feed ramps, made in the USA.
Bolt Carrier Group: The BCG is made from 9310 steel and has a staked gas key and black nitride finish. Chrome-lined, includes extractor spring and O-ring insert. Magnetic particle inspected.
80% Lower Receiver: Choose to receive a forged or billet Fire/Safe 80% lower receiver. Our lower receivers are anodized to match the upper receiver perfectly. and they come ready for machining of the trigger pocket and drilling of the safety selector and trigger pin holes.
AR-15 Lower Parts Kit: Includes all parts needed to complete the lower receiver including pistol grip, mil-spec safety selector, and trigger/fire control group.
Lower Assembly: Comes with complete buffer tube assembly including buffer, buffer spring, six-position buffer tube, latch plate, castle nut, and butt stock based on original Colt design.
Charging Handle: Standard, mil-spec, made from 6061 T6 aluminum.
Please note: This build kit requires that the builder complete the optional 80% lower receiver, but that’s the rewarding part of the experience (and the only way to build your own AR-15 without the need of an FFL transfer or serialization)!
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or “assault weapons” (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.