Shoot it with your duty ammo and if you use a flashlight attached check it with that... Indiana State police ended up swapping out their new g-22's for 17's after a heavy failure rate. Duty ammo was Speer Gold dot... Don't know about a chamber redesign, but the emmbedded serial number plate is the likely culprate with the Indiana State police guns... If you want to know more then come over to stoppingpower.net and look under the glock section... The thread their offers details with some of the people involved and they can shed more light on the issue... My personel G-23 is fine, but it does not have the new embedded plate.