The CMMG MK9 Firing Pin is a bolt component from CMMG (brand part no. 90BA4D7) sized for CMMG’s MkG/Banshee 9mm blowback bolt group. The firing pin strikes the primer to ignite each round as the bolt closes, and in a straight-blowback 9mm action it has to hold up to a different timing and impact profile than a locked-breech rifle bolt. It is a direct-fit replacement for CMMG’s 9mm platform.

Key Specifications

• It is sized for CMMG’s MK9 (MkG/Banshee) 9mm blowback bolt group.
• The firing pin strikes the primer to ignite each round as the bolt closes.
• It is built for CMMG’s straight-blowback 9mm action, a different timing profile than a locked-breech rifle bolt.

Frequently Asked Questions

What platform is this firing pin for? CMMG’s MK9 (MkG/Banshee) 9mm blowback bolt group.

Does this fit a 5.56 CMMG bolt? No, it is sized specifically for CMMG’s 9mm blowback bolt, not a rifle-caliber locked-breech bolt.

Buy the CMMG MK9 Firing Pin

Order the CMMG MK9 Firing Pin through our rifle parts selection at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop.