Cohaire Arms 10mm A U.S made MP5 clone using a demilled MP5 10mm kit for the build. Not too many MP5 10mm were produced after the cartridge became overshadowed by the softer recoil of the 40 S&W. MP5’s in 10mm use a different receiver than the 9mm models. They also use a straight box polymer magazine. I wish these were still in production, the 10mm Auto is becoming a lot more popular these days.