TacFire SSPK300LPK10: The TacFire Pistol Kit contains- .300 AAC Blackout 10.5\" Barrel/Parkerized; .308 spiral fluted flash can w/crush washer; AR15/.750 micro/low profile gas block/Mil-Spec/steel; pistol length gas tube w/pin/steel; ultra slim 7\" clamp on M-Lok free float handguard; AR15 5.56/.223/.300AAC stripped billet upper receiver w/M4 feed ramps; AR15 5.56 NATO bolt carrier group/MPI tested/Nitride; AR15/.556 Mil-Spec charging handle aluminum w/steel latch; dust cover; AR15 forward assist, AR15 standard receiver end plate; Mil-Spec/commercial castle nut/steel; pistol buffer tube w/foam; 3oz buffer w/tube spring; USA made AR15 lower parts kit and an AR15 standard A2 style black pistol grip.