AR-15 6.5 Grendel 22" Black Diamond Competition Bull Upper Assembly. You inquired and we listened. For a limited time, black diamond fluted Grendel uppers are put together just for you. This drop-in upper will attach to virtually any standard Mil Spec AR-15 lower assembly. Works best with your standard 5.56 Mags. Available in 416R Stainless Steel black diamond flute threaded bull barrels, with 1 and 8" twist and rifle keymod free float handguards. This twist rate is optimal for the shooter using today's popular heavier bullets. The free float handguard reduces the chance of accuracy-reducing pressure. The flute cools the barrels faster and makes it lighter.
Barrel - 22" 416 stainless steel fluted bull barrel. Available in Diamond, Spiral or Straight Black Stainless Flute. Nitride Plating is hand-made, done upon request. Hardened to 26-32 rc and stress relieved. Chambered in 6.5 Grendel Type 2. 1-8 rh twist. .936 under gas block. Threaded 5/8x24. M4 feedramps. Rifle gas system. Barrel is finished off by Competition Muzzle Brake.
A3 flat top upper receiver - made from certified 7075-t6 aluminum forgings. Black hardcoat anodized to Gov. Specs. Forward assist and dust cover installed. M4 feedramps.
Gas system - .936 low profile gas block, made from aircraft quality aluminum. Rifle length gas tube.
Handguards - 15" rifle-length keymod free float rail. Made from aircraft quality aluminum and black hard coat anodized. Rails may differ in design, based on stock availability, the same excellent quality. Also, you may choose quadrail option available on top of this page.
Does not come with BCG or Charging Handle. Can be purchased separately. This upper uses a true 6.5 Grendel .136 depth bolt.