A CMMG bolt catch for the Mk9 9mm AR-pattern platform. It locks the bolt open on an empty magazine and lets the shooter lock or release the bolt manually. This factory part is for Mk9 lowers. Compare the fitment details below with your firearm before ordering. Questions about fit can be sent to our team.
- Brand: CMMG
- MPN: 90CA572
- Type: Bolt catch
- Fits: CMMG Mk9
