28 Piece kit. All heat treated parts. AR-15 Standard Safety Selector Lever- 1 pc AR-15 Safety Spring and Detent pin- 1 set AR-15 Magazine Catch Kit with mag catch, release button and spring- 1 set AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin- 1 set 223 308 Buffer Tube Detent Plunger & Retainer Spring - 1 set AR-15 Takedown Pin & Pivot Pin - 2 Pcs AR-15 Takedown/Pivot Pin Detents & Springs - 2 sets AR-15 Hammer & Trigger Pin - 1 set AR-15 Hammer Spring - 1 pc AR-15 Trigger Spring - 1 pc AR-15 Disconnector & Spring - 1 set AR-15 Aluminum Trigger Guard - 1 pcs AR-15 Trigger Guard Pin - 1 pcs AR-15 Pistol Grip Lock Washer AR-15 Pistol Grip Screw