The Outerwild AR9 Lower Receiver Proprietary Parts Kit will work only with our billet AR9 lower receivers. The kit includes the following parts:
- Magazine Catch Lever
- Magazine Catch Spring
- Ejector
- Ejector Set Screws (2)
- Cap Screw for Rear Takedown Pin Detent Spring
- Upper Receiver Tensioning Screw
- Magazine Catch Screw
- Bolt Catch Screw
Installation instructions can be viewed or downloaded here.