Complete Upper Assembly - .300 AAC Blackout (16" Stainless Steel Barrel & 13.5" M-Lok Handguard)



If you’re in the market for a flashy way to convert your AR-15 from either a .223 or a 5.56mm NATO caliber to a .300 AAC blackout one, then you need this upper assembly.  Just pull the takedown and pivot pins on your lower, pull your old one off, drop this one onto your lower assembly and push the takedown and pivot pins back into place.  Simple.  All you’ll need after that is to add backup sights or an optic of your choice.

This upper assembly comes with a 16″ parkerized barrel with a pistol-length gas system.  You also get a 13.5″ M-Lok free floating handguard for all your attachment needs, such as grips or tac lights.

One more thing:  this item is on clearance, so once it’s gone, it’s gone.  Better hurry!


Gas System: Pistol-length
Barrel Profile: M4
Barrel Steel: 416R
Barrel Finish: Stainless
Chrome Lining: No
Muzzle Thread: 5/8×24
Chamber: .300BLK
Twist Rate: 1:8
Barrel Extension: M4
Gas Block Size: .750″
Gas Block Type: Low-profile
Muzzle Device: A2 Flash hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: 13.5″ lightweight M-Lok free float
Bolt Carrier Group Included: Yes
Bolt Steel: 9310 steel, magnetic particle inspected
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Overall Length: 24.5″

Benefits of the 16” Pistol-Length Parkerized AR 15 Upper Assembly:

  • 100% legal to own and ship to your front door
  • Not considered a firearm – no FFL paperwork needed!
  • 4140 steel barrel and Freedom parts kit ensure sub-MOA accuracy
  • Prebuilt upper with gas system removes the guesswork of rifle making
No FFL required  Made in the USA  Lifetime Warranty

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