I just got done building a limited glock 35, Dawson sights and extra heavy magwell, fulcrum trigger kit, zev mag release, tungsten guide rod with a 14lb spring, and im using Dawson toolless pads. I can fit 20 in one mag and 19 in the other 3. I still need to get a barrel fit to it but as of now the stock barrel suits my abilities just fine. I also got some tru grip grip tape stuff for it and there awesome. As for round count on used guns the worst I seen was a 22 with about 20k on it and there was a spring give up in the trigger and 2 of the 3 pins were broke but after a good inspecting and $4 in parts it was good to go.again.