Tacfire's.308 lower parts kit includes one each of the following- pgar-b pistol grip pistol grip screw pistol grip lock washer trigger (usa made) trigger pin trigger spring angled trigger guard hammer (usa made) hammer spring hammer pin bolt catch roll pin bolt catch spring detent spring bolt catch buffer take down detent bolt catch magazine catch spring magazine catch button magazine catch front pivot pin detent selector take down pin buffer retainer pin buffer retainer spring disconnector spring disconnector selector and selector spring.Type: Lower Parts KitGun Model: AR-10 Lower Parts KitGun Type: AR PlatformCaliber: 308 Win