I might shoot open division with my single stack gun . . . because I can. In fact, my open classifiers (I think I have 4 or so) were all shot with either a Colt Commander in .45ACP or a Sig Sauer P226.
I'll probably stick to the 9mm, though, since I'm too delicate to manage the recoil of the mighty .45ACP.
I'll probably stick to the 9mm, though, since I'm too delicate to manage the recoil of the mighty .45ACP.