5.56 AR 15 Rifle Kit – 16″ Stainless Barrel (Fixed Front Sight), 1:7 Twist Rate

Are you looking for the perfect AR-15 Rifle Build Kit? Look no further. This Build Kit is ideal for any level of operator, looking to build their very own AR-15 rifle. This kit comes with a 16” mid-length 5.56 barrel and a mounted Front Sight. This barrel length is perfect for a new weapon owner, or an experienced operator. The ideal options for any and all operators looking to complete their first build, or add another weapon to your collection.
What’s Included
This kit is not a firearm. It includes an assembled upper receiver, bolt carrier group, lower parts kit, and buffer assembly with the buttstock. 
5.56 AR Rifle Kit Specs
Barreled uppers are assembled in-house before shipment.
Barrel

Chamber: 5.56 NATO
Contour: M4/Government
Length: 16”
Twist Rate: 1:8
Gas System: Carbine
Gas Port: 0.750”
Gas Hole Dia.: 0.070”
Muzzle Threads: 1/2×28
Feed Ramps: M4
Material: 416R Crucible Stainless
Finish: Stainless
Process: Button Rifled
Lining: Stainless
Extension: M4
Muzzle: A2 “Birdcage” Flash Hider

Handguard

Attachment System: Two-Piece A2 Handguard
Finish: Matte Black
Top Rail: None
Material: Polymer w/ aluminum heat shield
Attachment: Mil-Spec Delta Ring

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: 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 not included.

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 Restrictions
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.

GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.