Which begs the question...
Why?
First off, I'm assuming it's because somebody is either recoil sensitive, or has a large stash of 9mm, or loads exclusively for it, and needs a 1911 to shoot it all. If you want a large frame 9mm, do what Uncle Sam did and get the Beretta 92, at least then the bulk of the pistol is justified by it's high-capacity magazines. Or the Browning Hi-Power. Detonics did offer one of their shorty variants (COmbat Master?) in 9mm, maybe that's what a person means by a 9mm 1911? I'm just really curious, in this day and age of 10-round magazines, what advantage does Old Slabsides offer in 9mm Luger over his .45 ACP brother? And I'm not talking 9x21, or 9x23, or 9x25 Dillon, just the plain vanilla 9x19 Luger.