guys like to think that they can make their .45 do the carbine's job, but I"ve seen world champ ISPC shottists miss the entire torso target,at a mere 10 yds, just because they were trying to draw and hit faster than me! That was in good light, with ear and eye protection, on stationary, fully exposed targets, and nobody trying to kill them. you can just forget the pistol being effective, when it's for real, beyond about 5 yds, unless it's an ambush thing, on one man, from cover, using eye and ear protection, a braced firing position. then you MIGHT want to risk it from 25 yds or so. So the pistol for SHTF is a 1 lb pocket 9, with just one spare mag and ammo for both mags. Practice will be out of the question, the noise will call in your killers.