When I was carrying my 1991A1 Commander or the 9mm Commander, I shot my carry ammo once a month. This came to 25 rounds of Gold dot .45 and 30 rounds of 9 HST minimum a month. I use to shoot pin matches with the 1991A1 so I don't know how many rounds are through that one, other than a lot. The 9mm has about 1800 rounds. Now that I carry a lawnmower pistol, P365, I don't get to the range like I did in the past. This is mainly because it feels like a screwdriver you carry on your keychain for just in case. Anyway the Sig has 1680ish rounds through it. As far as having a low count gun to carry, it depends on the maintenance that's done. When I was shooting the pin matches, I tore my pistol down to bare frame, cleaned, inspected every part and replaced the recoil spring after every match. Other parts, pins and springs got replaced as needed. If maintenance is done like most people treat their lawnmowers then yes, I would suspect that a low count gun would have a better chance of not going down unexpectedly but Murphey's law applies to all of us. YMMV