Mil-Spec (4150) M4 Barrel with QPQ Nitride and Custom, Ultra-Light 13.5" Handguard.
This AR-15 prebuilt upper assembly is ultralight and arrives at your door ready to provide MOA accuracy with a hardened mil-spec barrel and the industry’s most protective and accurizing finish, QPQ Nitride. Providing plenty of real estate for your add-ons in a lightweight configuration is our new, custom-made aluminum 13.5" M-Lok handguard with a split top rail to cut down even more of the weight. This upper comes complete with a quality chrome-lined M16 full auto profile BCG and charging handle all inside a mil-spec forged M4 flattop upper.
What’s Included
This kit is not a firearm. It includes an assembled upper receiver, lower parts kit, and buffer assembly with buttstock.
Here's the beginner's guide to 80% lowers.
AR-15 Rifle Kit Specs
Barreled uppers are assembled in-house before shipment.
Barrel
- Chamber: 5.56 NATO
- Contour: M4/Government
- Length: 16”
- Twist Rate: 1:7
- Gas System: Carbine
- Gas Port: 0.750”
- Gas Hole Dia.: 0.070”
- Muzzle Threads: 1/2x28
- Feed Ramps: M4
- Material: 4150 CMV
- Finish: QPQ Nitride
- Process: Button Rifled
- Lining: QPQ Nitride
- Extension: M4
- Muzzle: A2 “Birdcage” Flash Hider
Handguard
- Attachment System: 13.5" M-Lok
- Finish: Type III Hardcoat Anodized (Mil-Spec)
- Top Rail: M1913 Picatinny
- Material: Billet 6061-T6 Aluminum
- 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: Carpenter No. 158 (Mil-Spec)
- Exterior: Nitride Coating
- Interior: Chrome-Lined
- Gas Key: Staked, Chrome-lined
- 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.
Shipping Restrictions
We cannot ship certain parts and accessories to states that prohibit the sale or ownership of such components, like California, New York, and others. Before ordering, see our shipping restrictions for a list of all prohibited states and locales. We try our best to keep our shipping restrictions current, but state laws change almost daily. It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm.
80LowerJig.com only ships within the United States. Federal law prevents international shipments of our products.
WARNING: Handling firearms parts and certain firearm 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, visit www.P65Warnings.ca.gov.
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.
www.80lowerjig.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
