AR-74 5.45x39 16" fluted stainless steel tactical upper assembly, This drop-in 5.45x39 upper will attach to virtually any standard mil-spec AR-15 lower receiver. All you need is this upper and 5.45x39 BCG to go into a completely new caliber to take advantage of AR-74. Available in 416R Stainless Steel threaded barrels or 4150 Steel Black Nitride Finish.
Barrel - 16" 416 stainless steel hbar barrel, straight fluted. Hardened to 26-32 rc and stress relieved. 6-groove button rifled. Chambered in 5.45x39mm. 1-8 rh twist. .750 diameter under gas block. Threaded 1/2x28. M4 feedramps. Carbine length gas system. Barrel is finished off by a triport 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 - .750 low profile gas block, made from aircraft quality steel. Carbine length stainless steel gas tube.
Handguards - Mid-length keymod free float rail. Made from aircraft quality aluminum and black hard coat anodized.
Does not come with BCG or Charging Handle. Can be purchased separately.