A friend of mine is offering a mac11 for sale, i just want help identifying it. It's an open bolt design, and as pictured has original M.A.C. as the maker according to stamp. But according to my research m11 in 9mm was only ever made by SWD and all others are 380 acp/9mm auto k.. I'm confused as this appears to be an authentic mac but according to my research this isn't possible.. please see pictures attached.. any help identifying this would be appreciated.. cheersView attachment 32378