Hey Wash, this is one of my favorite rounds. I have the Five-seveN pistol, the PS-90 bull-pup, and a 10" AR upper that takes the 5.7x28mm round (http://www.57center.com). I've shot about every kind of ammo made in 5.7 -- 190, 192, 194, 195, 197. I have over 7K rounds of this ammo on hand. Of all of them, the one I choose to shoot most is the 40 gr. SS197SR. I had my Five-seveN barrel extended and threaded by Tornado Technology and wanted some sub-sonic 5.7 rounds to shoot suppressed, so I ordered some Quie-TOR rounds from elite ammo. I shot a few and couldn't figure out why the holes on the target looked so big, and when I checked it the rounds were keyholing at 10 yards. I took the suppressor off and shot a couple more rounds and again they were keyholing. I wrapped the rest up and sent them back to elite, and about a freaking year later I got a refund on the unused rounds. I cannot in good conscience recommend that you buy elite ammo. I haven't done the mod, don't need to in my opinion, but I wouldn't be scared of it if you think you want to. Tell me this isn't the easiest pistol you've ever field stripped, I dare ya. If there is something that tears down easier or quicker, I have yet to see it. :D