Does anyone make one except Rock Island? I looked at their site and all I saw was a Tac version with a rail. Would prefer to not have the rail. I am not sure whether I would rather put the rail or go with a single stack. Also in 45acp most if not all of the single stack mags will fit any 1911 or so it seems. Is this the case also with the 9mm 1911s. Who makes decent reasonably inexpensive single stack 9mm magazines?