If you want the versatility of a standard 3/4x10 9mm thread and also want a 1/2x28 thread, for your Mac-10 9mm, then this is the barrel for you. It offers machined 1/2x28 threads on a standard Mac-10 9mm barrel so you can thread on suppressors and muzzle brakes. (Mac-10 9mm barrel only, other barrels sold separately)*
Approximation to protect seller's privacy