All the parts you need to get started on your next AR15 build in convenient color-coded packets to simplify assembly. Check out our interactive install walkthrough video below or read our LPK Install resource article for an in-depth breakdown. Combine this kit with a Buttstock or Brace kit to complete your lower group.Kit Includes:Bolt catch/roll pinBolt catch plunger/springTrigger guard/roll pinTriggerTrigger springDisconnectorDisconnector springHammerHammer springTrigger/hammer retaining pinsSafety, detent, & springMagazine catch, spring, & release buttonPivot/takedown pins, detents, & springsA2-style pistol grip/grip screw & washerBuffer retainer/spring