Introducing the alexander arms 6.5 grendel upper kit! this kit has everything you need to get started on your very own 6.5 upper build! the kit includes: mil-spec flat top upper receiver (port door and forward assist installed), our very own high quality 16" stainless, extreme lightweight barrel with a 1:8 twist, threaded 5/8-24 tpi rh, complete bolt carrier and 6.5 grendel bolt,.875 gas block, mid-length gas tube, mil-spec charging handle, one 10 round magazine, the kit does not include a barrel nut or handguard.Receiver Finish: Black CerakoteCaliber: 6.5 GrendelSights: None, Optic ReadyBarrel Length: 16"Barrel Material: Stainless SteelTwist: 1:8"Barrel Length Range: 16" to 16.99"