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 pin Bolt catch plunger/spring Trigger guard/roll pin Trigger Trigger spring Disconnector Disconnector spring Hammer Hammer spring Trigger/hammer retaining pins Safety, detent, & spring Magazine catch, spring, & release button Pivot/takedown pins, detents, & springs A2-style pistol grip/grip screw & washer Buffer retainer/spring