AR-15 .450 Bushmaster 10" "Thumper" Pistol Upper Assembly - Just add this .450 Pistol Flattop Upper to your AR15 Pistol Lower Receiver, and you are ready for the range. This assembly includes 10" heavy profile .450 Bushmaster barrel with slim 10" free-float handguard, available in your choice of mlok or quadrail. Barrel is finished off with A2 flash suppressor and is made of 4150 CMV steel, rifled in 1x24" twist.
Barrel - 10" 4150CMV steel black nitride medium profile barrel, M4 feedramps, non-fluted. Chambered in .450 Bushmaster. Button rifled with 1-24 rh twist. .750 under gas block diameter. Threaded 5/8x24. Carbine length gas system. Barrel is finished off by A2 birdcage flash hider 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. Carbine-length stainless steel gas tube.
Handguards - 10" slim profile MLOK free float rail. Made from aircraft quality aluminum and black hard coat anodized. You may choose your rail preference on top of page.
Comes assembled. Test-fired for cycling. Does not come with BCG or Charging Handle. Can be purchased separately.