I am considering swapping my Glock 23 for a Glock 37 in 45 GAP. My question is... How hard is it to find 45 GAP in portland? Is there a huge difference switching from 40SW to 45 GAP? Can anyone tell me about the 45 GAP round? I know nothing about it? All in All is it a good trade? Might I add my 23 is 2nd Gen, this is 3rd. I also have a 1911 in 45 ACP, whats the difference between 45 ACP and 45 GAP?