CMMG ZEROED Ambi Mag Catch and Button Kit Mk9 Radial Delayed Blowback. Specifications for CMMG ZEROED Mk9 Ambi Mag Catch And Button Kit: Manufacturer: CMMG Gun Make: CMMG Gun Model: CMMG Mk9 Package Contents: CMMG ZEROED Mk9 Ambi Mag Catch And Button Kit What firearm models does the manufacturer say CMMG ZEROED Mk9 Ambi Mag Catch And Button Kit is compatible with? The manufacturer says that CMMG ZEROED Mk9 Ambi Mag Catch And Button Kit is compatible with CMMG Mk9CMMG 91AFFA4: ZEROED Ambi Mag Catch and Button Kit Mk9 Radial Delayed Blowback