THIS KIT INCLUDES: Ambi Safety Selector Switch Ambi Safety Selector Body Ambi Safety Selector Cap Ambi Safety Selector Screw Two-Stage Hammer Assembly Hammer Spring Disconnector Disconnector Spring RugerA(R) Elite 452A(R) Trigger Trigger / Hammer Pin x2 Trigger Spring Safety Selector Detent Ejector Spring Magazine Catch Magazine Catch Button Magazine Catch Spring Bolt Catch Bolt Catch Spring Bolt Catch Plunger Bolt Catch Pin Takedown Spring Detent x2 Takedown Spring x2 Pivot Pin Takedown Pin Buffer Retainer Buffer Retainer Spring Trigger Guard Pin Trigger Guard Assembly MagpulA(R) MOE-K2A(R) Grip Grip Screw Washer Grip Screw and Adjustment Screw.IMPORTANT: These components are built to Ruger's standard of rugged reliability and are intended for use in AR-15 pattern firearms. However due to the wide variety of firearms and components available in the marketplace Ruger cannot guarantee that these components are compatible with all firearms. We cannot guarantee performance or fit and recommend installation by a qualified gunsmith to ensure maximum safety and performance.