The TacFire SS-RK6 6.5CRD rifle build kit contains- 20" 6.5 Creedmoor barrel, NIB extension/nitride; birdcage flash hider w/crush washer;AR15/.750 micro/low profile gas block/mil spec/steel; mid length gas tube with pin/steel; 15" .308 low profile MLOK free float handguard; .308 DPMS low profile stripped upper receiver /AR 10/.308 charging handle aluminum w/steel latch; dust cover; AR15 forward assist; AR15 standard receiver end plate; Mil-Spec/commercial castle nut/steel; buffer tube aluminum; AR 10 3.8 oz heavy buffer w/tube spring; AR15 enhanced pistol grip; AR10 .308 bolt carrier group. *Sports South Exclusive.