Yolla; The Colt wouldn't necessarily need to be gated. Mazo's version could be simply cut out at the recoil shield, allowing loading from the rear. So long as you don't point it up to the sky while cocking, it should run fine, being that when in battery there's no chamber aligned with the loading port. The issue then becomes extraction-- If spent cases don't fall out, you need something to poke them out. Low pressure loads help prevent cases from staying put initially, but I would imagine that fouling could make for the need to push them out. There is the choice of removing the loading lever and installing a conversion type ejector rod, or carrying a stick.