31 Piece Lower Parts Kit With FCG, for .223/5.56/M4

For .223/5.56 AR-15/M4, includes: bolt catch, bolt catch plunger, bolt catch roll pin, bolt catch spring, buffer retainer pin, buffer retainer spring, detent spring, disconnector, disconnector spring, pistol grip, hammer, hammer pin, hammer spring, magazine catch button, magazine catch spring, magazine catch, pistol grip lock washer, pistol grip screw, pivot pin, pivot pin detent, safety deten, selector, selector spring, take down pin, take down pin detent, trigger, trigger guard, trigger guard roll pin, trigger pin, trigger spring.