The TacFire Rifle SS-RK308-LPK-20BN Kit contains .308 Winchester 20″ barrel/nitride; NIB extension rifle length gas tube with pin/steel; .308 low profile slim MLOK handguard 15″; .308 DPMS low profile stripped upper receiver (GEN.3), AR-10/.308 charging handle aluminum w/steel latch; AR-10 dust cover; AR-15 forward assist; AR-15 standard receiver end plate; Mil-Spec/commercial castle nut/steel; Mil-Spec buffer tube/aluminum; AR-10 3.8 oz heavy buffer w/tube spring; AR-15 Mil-Spec M4 style 6 position stock w/QD sling swivel/butt pad/.308 lower parts kit no grip/AR-15 enhanced pistol grip; AR-10 bolt carrier group DPMS profile *Sports South Exclusive.