AR-15 5.56/.223 18" STAINLESS STEEL BLACK "GOLF BALL" UPPER ASSEMBLY features:
Barrel - 18" 416r stainless steel hbar barrel, nitride coated and stainless fluted. Hardened to 26-32 rc and stress relieved. Chambered in .223 Wylde (accepts both rounds, 5.56 and .223). 1-8 rh twist. Button rifled. .750 under gas block. Barrel is finished off with a stainless steel tri port muzzle brake and crush washer. M4 feedramps.
A3 flat top upper receiver - made from certified 7075-T6 aluminum forgings. Black hardcoat anodized coated to gov. specs. Forward assist and dust cover installed. M4 feedramps.
Gas system - .750 low profile aluminum gas block, hardcoat anodized. Mid length gas tube.
Handguards - Free float mid-length slim profile handguard, anodized black.
Upper assembly is fully complete, does not come with BCG and CH.