AR-15 5.56/.223 18" stainless steel spiral fluted tactical upper assembly features:
Barrel - 18" 416 stainless steel hbar contour barrel with x-treme fluting. Hardened to 26-32 rc and stress relieved. Chambered in .223 Wylde (accepts 5.56Nato and .223Rem rounds). 1-9 rh twist 6 groove button rifled. .750 diameter under gas block. Threaded 1/2x28 with stainless steel muzzle brake and a crush washer. M4 feedramps.
A3 flat top upper receiver - made from certified 7075-T6 aluminum forgings. Black hardcoat anodized and teflon coated to gov. specs. Forward assist and dust cover installed. M4 feedramps.
Gas system - .750 low profile gas block, steel and black hardcoat anodized. Mid length gas system.
Handguards - 12" mid-length free floating quad rail handguard. Made from aircraft quality aluminum and black hardcoat anodized.
Does not come with BCG and charging handle. Can be purchased separately.