AR-15 .450 Bushmaster 18" steel black nitride upper assembly, This drop-in .450 Bushmaster upper will attach to virtually any standard AR-15 lower assembly. Available in 4150 Steel Black Nitride Finish, with 1 and 24" twist and rifle length slim keymod free float handguards.
Barrel - 18" 4150CMV steel black nitride hbar barrel, M4 feedramps, non-fluted. Chambered in .450 Bushmaster. Button rifled with 1-24 rh twist. .750 under gas block diameter. Threaded 5/8x32. Midlength gas system. Barrel is finished off by muzzle brake in hardened steel construction, black.
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 - .750 low profile gas block, made from aircraft quality steel. Mid-length gas system
Handguards - Rifle-length keymod free float rail. Made from aircraft quality aluminum and black hard coat anodized. You may choose your rail preference (keymod or mlok on top of page).
Does not come with BCG or Charging Handle. Can be purchased separately. For Bushmaster, currently only Bolts are available for BCG, if in stock.