I am ready to purchase my second Glock, and I need help choosing between the two. I have handled both at my LGS, and both feel really good in the hand. I don't know if I would want to carry this one, since I already own a compact 9mm though it would be nice to carry a .45. So far it seems it will be a range and nightstand gun. I am left handed so I prefer my magazine release on the opposite side, so the gen 4 G21 get one point. I would like to carry it on a rare occasion, so the G30 gets one point. I was told the g21 gen 4 without back straps is an SF model, is this true? if so one point for G21 since I don't like the beefier frame on the previous generations. One point for the g30 just because it servers many purposes (range, nightstand, CCW) So I need a tie-breaker. Please help me make my mind up. Which shoots better, Which recoils less? Which one is the king of .45s?