Everything you need for your custom build, and nothing you don't. Just the basics from KAK.
Specifications:
- Bolt Catch Kit
- Magazine Catch Kit
- Takedown Pin/Detent/Spring
- Pivot Pin/Detent/Spring
- Buffer Retainer Pin/Spring
- Ambi Selector/Detent/Spring
- Hammer and Trigger Pins
- Hammer/Trigger/Disconnect Spring
- De-Grease Ambi Selector Screw Threads and Apply Blue Loctite When Assembling