Many 1911s have unramped, unsupported barrels with a huge chunk of the cartridge hanging out. Many have been throated to feed JHP. There should be 1911s exploding everywhere if that were the case.
45 ACP operates under very low pressures, it's one of the characteristics of the round, unless you decided to feed some 45 Super to an unramped 45 ACP, you shouldn't have problems.
Every 45 ACP Glock I've owned has had fully supported, ramped barrels. I guess you could polish and throat one to have less support, but even then unless you're shooting super, reloads, etc--but even then most Glocks will tolerate +P.