The .45 GAP is a good cartridge. It is a darned shame Glock screwed up the aftermarket support for it.

In all fairness though, based on my reading Glock never saw it as anything but intended for deployment in a very limited market. So maybe it hasn't taken off in popularity is by design . . . I obviously don't know for sure. All I do know for sure is that even with ammo cost and availability I'd rather carry a GAP than a 9mm - and that clearly is not consistent with Glock's philosophy.