I have owned more than one Glock in my life and I found that they just did not fit my hand very well. Well I find myself with a case of 357 sig ammo and no gun to shoot the ammo in. The choice of guns are limited to mostly sigs[$$$] or the Glock. Yes I know I can get a Sig 320 but I just don't care for them. My question is does the changeable back strap on the Gen 4 give one a better fit for the hand over the older Glocks