This is our AR-15 lower receiver Fire Control Group Kit. Also included are the disconnector, pins and springs.
Includes:
Magazine Catch Assembly w/Button and Spring
AR-15 Single Safety Selector Lever
AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin -Black
223 308 Buffer Tube Detent Plunger & Retainer Spring
Takedown/Pivot Pin Detents & Springs - 2 sets
Safety Spring and Detent pin - 1 pc
Hammer Pin -2 pcs 
Takedown Pin
Pivot Pin