From the Troopers I have spoke to the GAP shoot's softer and with less muzzle flip than
the 9mm. I would rather have the glock 17 loaded with speer gold dot 124 grain plus p. than 10 rounds of a not so much more powerful 45 gap. and just 20 more rounds for back up with the 2 spare mags they are issued. the glock 21sf would have been an even better choice in the 45 arena.