Reliable. Versatile. Range-ready. When it’s time to assemble your next build, don’t settle for piecing together random parts. This AR-15 rifle kit gives you the perfect foundation for a high-performance build, pairing our premium 5.56 NATO stainless steel upper with all the essential furniture you need to finish your receiver.
Whether you're building a precision paper-puncher or a rugged general-purpose rifle, this kit streamlines the process. The upper features a 16” 416R stainless steel M4 contour barrel with a 1:8 twist, wrapped in a 15” M-LOK split rail handguard. You get the weight-saving benefits of an advanced split-rail design combined with the corrosion resistance and accuracy of stainless steel. We’ve included the mil-spec lower parts kit, buffer tube assembly, and M4-style stock so you can spend less time sourcing parts and more time at the bench.
Just add your stripped lower receiver, and you’re ready to get to work.
Barrel
- Chamber: 5.56 NATO
- Contour: M4
- Length: 16”
- Twist Rate: 1:8
- Gas System: Carbine
- Gas Block: 0.750”
- Muzzle Threads: 1/2 x 28
- Feed Ramps: M4
- Material: 416R Stainless Steel
- Finish: Stainless
- Muzzle: Twisted Flash Hider
Handguard
- Attachment System: Free-Float 15" M-LOK
- Finish: Anodized Black
- Top Rail: Picatinny, Split Rail
- Material: 6061-T6 Billet
- Attachment: Barrel Nut
Upper Receiver
- Profile: M4 Flattop
- Material: Forged 7075-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
- Profile: M16/Full-Auto
- Steel: 9310 Tool, HPT/MPI-tested
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: Staked
- Charging Handle: Included
Lower Receiver Parts
- Buffer System: Mil-spec, Carbine
- Buttstock: Mil-spec, M4-type
- Parts Kit: Mil-spec, single-stage
Lower receiver sold separately.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
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.
- Caliber:
- 5.56
- Barrel Finish:
- Parkerized
- Twist rate:
- 1/8
