HamMach...dont think you can go wrong with the m&p. I think that the reason for better accuracy in longer barreled handguns is because the additional rifling allows the bullet to increase velocity and rate of twist...more spin. Also, the longer the sight radius the more precision while aiming. Kinda like why target shooters may prefer longer versions of a particular model...ie the pro over the standard m&p. Also why you servicemen and women carry a rifle/carbine as the main weaponry over the handgun. More power and precision in aiming. Welcome to the forum and thanks
for your service.