I'm new to this forum, and a LEO in PA. My department is switching to Glock 37's in .45 GAP. We previously had .40 Beretta's. I'm trying to decide on a back up, between a Glock 27 ( 10 shot) or the new Glock 39 ( 6 plus one) in .45 GAP. I was never a big .40 fan, but can get ammo pretty cheap. I was thinking of carrying the .40 with 165 grn Golden Sabres. Would that be a good defensive load. I'm looking for any opinions on my choices and any feed back on the .45 GAP as far as actual shootings, and on the .40 caliber with a lighter grain bullet. We carry 180 grn in our Berretas. Thanks in advance.