Build the custom rifle you want without shooting holes in your budget. The Anderson Manufacturing 16 6.5 Grendel Upper is an optic-ready, forged upper receiver featuring a 16 barrel with 1:8 rate-of-twist rifling and .308 A2 flash hider. Includes standard charging handle and phosphate 6.5 BCG. A2 carbine handguard. .750 standard carbine gas block. Type: AR-15 Uppers.