Looking for the quickest, easiest, and most affordable way to build a lightweight, .300 AAC blackout AR-15? This build kit comes with the finishing piece, built and ready: our complete 16" rifle upper chambered in .300BLK with skeletonized 15" M-LOK handguard, BCG, and charging handle. This featherweight .300 blackout upper offers superior accuracy with tons of rail space for mounting front sights and other accessories. Some serious aesthetics are a plus with its unique skeletonized handguard.
This full-built upper features a mil-spec type III hard-coat anodized finish with a classic, mil-spec M4 flat top upper receiver. M4 feed ramps ensure reliability, and a picatinny rail provides mounting for any standard optic or rear sight. Forged from 7075 T6 aluminum, this upper's as tough as any black rifle gets. Inside you'll find a quality, black nitride-coated bolt carrier group made of 9130 steel with chrome-lined gas key and charging handle. This kit comes complete with everything needed to build your own .300 blackout rifle.
300 Blackout Upper Barrel Features:
- Chambered in .300BLK
- 16" with parkerized finish
- 4150 chromoly steel
- contoured profile
- 1:7 twist rate
- 5/8 x 24 thread pitch
- A2 birdcage flash suppressor
- 15" M-LOK skeletonized handguard
- Carbine-length gas system (0.085 Hole)
- Low profile gas block (0.750)
- M4 flat top upper receiver
- M4 feed ramps
- Carbine gas tube
- Charging handle
- Chrome-lined BCG
300 Blackout Build Kit Extras:
- Buffer tube and spring
- Enhanced stock
- Lower parts kit
- 7075 80% forged lower receiver
No FFL Required
This complete, plug-and-play .300 blackout build kit is the most effective way to finish your .300 blackout AR-15 without any guesswork. The entire barrel and gas system are head spaced and pre-installed, and everything ships to your door with no FFL required and no paperwork needed!
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.