Tacfire AR-15 Lower Parts Kit contains: (1) Trigger Stainless Steel (1) Trigger Pin (1) Trigger Spring (1) Trigger Guard (1) Hammer Stainless Steel (1) Hammer Spring (1) Hammer Pin (1) Bolt Catch Roll Pin (1) Bolt Catch Spring (1) Detent Spring (1) Bolt Catch Plunger (1) Take Down Detent (1) Bolt Catch (1) Magazine Catch Spring (1) Magazine Catch Button (1) Magazine Catch (1) Front Pivot Pin (1) Detent Selector (1) Take Down Pin (1) Buffer Retainer Pin (1) Buffer Retainer Spring (1) Disconnector Spring (1) Disconnector (1) Selector (1) Selector Spring.