The AR-15 LPK spring kit contains the coil springs included in a lower parts kit for the AR-15 rifle. It includes the trigger spring, hammer spring, disconnector spring, safety detent spring, magazine catch spring, and bolt catch spring. Each spring provides tension to reset fire control parts or hold detents in position. Builders use this kit to complete a lower receiver or replace worn springs in an existing build. All springs fit standard mil-spec AR-15 lower receivers.