I have never seen a 9mm 1911 that was not a jam-o-matic. the 1911 was designed around a certain C.O.L. and it tends to not like anything shorter. Perhaps if some one was willing to learn how to time the mags and recoil springs to make one work they would be OK. But your average ccw holder is not gonna take that amount of intertest in their weapon.Why's that?