Our .300 blackout rifle build kit might be the most affordable .300 AAC blackout build kit on the market, featuring outstanding quality and accuracy, with a minimalist design. This complete .300BLK chambered upper assembly comes with a classic A2 handguard, and everything is kept simple and lightweight. This rifle's upper assembly and handguard are reminiscent of the old school rifles from our nation's previous era while still having been put through some of the most rigorous quality controls, and everything's built in the USA.
Mil-Spec Construction and Quality
In addition to its classic look, our .300 blackout rifle upper is built to military specifications. Forward of the standard flat top M4 upper you'll find a 4150 chrome moly steel barrel with M4 feed ramps. It's also got a chrome-lined bolt carrier group, and standard charging handle. This barrel's heavy profile guarantees accuracy up to 1 MOA if you're good enough. In addition to coming equipped with a mil-spec carbine gas system, it's got a removable A2 birdcage flash hider that makes switching from supersonic to subsonic loads and going suppressed a breeze.
300 Blackout Rifle Barrel Features:
- .300 AAC blackout chamber
- 16" with parkerized finish
- 4150 chrome moly steel
- Heavy profile
- 1:8 twist rate
- 5/8 x 24 thread pitch
- A2 birdcage flash suppressor
300 Blackout Receiver Features:
- USGI-type A2 handguard
- Carbine-length gas system (0.125 Hole)
- Low-profile gas block (0.750)
- M4 flat top upper
- 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 first .300 blackout AR-15 without any guesswork. The barrel and gas system are head spaced and pre-installed, and everything ships to your door with no FFL required and no paperwork needed!
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.