Real time inventory.  No backorders.

5.56 AR 15 Rifle Kit - 16" Phosphate Barrel, 1:8 Twist Rate with Classic A2 Handguard - Blem



In the climate of our current firearms industry, affordable is good. Affordable and high-quality in a mil-spec AR build kit is even better. And if you're into the classic look of a service-issued M4 Carbine, then go for full authenticity and save a ton of cash with this cosmetically “blemished” A2-style build kit. Your black rifle will get dents and dings at the first range day, anyway.

Even with a minor scratch on the receiver or a tiny nick in the handguard, nothing prevents this reliable AR from performing with any 5.56 or .223 loads you can send. Everything about this kit exudes "mil-spec," including the phosphated M4-profile barrel minus the upgraded BCG, but that's for a little better performance. The bolt carrier group sports a heat-treated 9310 bolt with a QPQ nitride treatment that provides the same heat resistance and corrosion protection as chrome lining and phosphate, while also providing a "slicker" action that requires less lubrication.

Barrel Features & Specs:

  • Barrel Length: 16”
  • Gas System: Carbine
  • Barrel Profile: Government
  • Steel: 4150 CMV
  • Barrel Finish: Phosphate
  • Chrome Lining: No
  • Muzzle Thread: ½-28
  • Chamber: 5.56 NATO
  • Twist Rate: 1:8
  • 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: Heat-treate9130
  • 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)

AR 15 Rifle Kit Details (Expanded):

Barrel: 16″ mid-length, 4150 CMV steel with mil-spec Phosphate coating, chambered in 5.56 NATO, 1:8 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 carrier is made from mil-spec 8620 while the bolt is made from heat-treated 9310 steel. Staked gas key with Grade-8 fasteners and black nitride finish. Includes extractor spring and O-ring insert. High-pressure tested (HPT) and magnetic particle inspected (MPI).

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)!

Made in the USA Lifetime Warranty

Shipping Restrictions

AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. 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 (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. We try our best to keep our shipping page current, but laws change daily.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.