The LBE AR15 Lower Parts Kit includes the following: Trigger Guard Roll Pin; Pistol Grip Screw & Lock Washer; Disconnector & Spring; Trigger, Spring, & Pin; Hammer, Spring, & Pin; Bolt Catch, Buffer, Spring & Roll Pin; Magazine Catch & Spring; Magazine Release Button; Selector, Detent, & Detent Spring; Takedown Pin, Pin Detent, & Pin Detent Spring; Pivot Pin, Pin Detent, & Pin Detent Spring; Buffer Retainer & Retainer Spring.