Rifle Build Kit (Complete) - 300 Blackout (16" Barrel & 15" Lightweight Keymod Handguard) AR 15



Want an AR upper that's lightweight, while retaining the most rail space possible? How about the most accurate, well-built AR capable of shooting subsonic suppressed and supersonic with one gas system and barrel? If that sounds expensive, think again. You've found the perfect AR Build Kit: Our .300 AAC blackout rifle upper assembly comes with 16" barrel and 15" lightweight Keymod handguard. This upper assembly a ton of rail space with the least weight possible, and its profile, capability, and reliability make this AR upper assembly a standard go-to rifle for any level of operator.

Made in The USA

Sure, a lot of rifle parts are built in the US, but our .300 blackout rifle upper assembly is miles ahead of the rest. Each upper assembly features a barrel constructed from 4150 Chromoly Vanadium (mil-spec CMV), with M4 feed ramps, standard flat-top M4 upper receiver, Keymod and picatinny rail attachments, type III hard coat anodizing, and the expectation of providing 1-MOA accuracy at 100 yards if you're good enough.

300 Blackout Rifle Barrel Features:

  • .300 AAC blackout
  • 16" heavy, fluted, Parkerized
  • 4150 CMV (mil-spec)
  • 1:8 twist rate
  • 5/8 x 24 thread pitch
  • A2 birdcage flash suppressor

300 Blackout Receiver Features:

  • 15" Keymod 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 AAC blackout build kit is the most effective way to finish your first 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!

No FFL required  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.