Posted this on two other forums, but got no real responses, so posting it here and see there are some ideas out there: Replaced my factory G23 barrel with a Storm Lake. Now I am having A LOT of misfires with certain ammo- UMC 180gr fmj flat nose and Fiocchi 165gr fmj flat nose primarily. I am getting the click but not the boom (light strikes) on about 3-5 rounds per magazine. And I get some stove pipes as well, but not as often as that unnerving click. When I put the factory barrel back in, no problems at all with these rounds. What gives? Defective barrel? Or do the tighter tolerances of of the SL barrel just make it more finicky? Anyone else have similar problems? Thanks in advance for the feedback. UPDATE: been in contact with SL and they are saying it may be that the chamber is too tight, to send it to them for eval and correction if that's the case. I'm confused because if that's the case there should be way more people having the same problem, considering the barrels are made to very exact tolerances using computerized CNC machines- i.e. the chances of a single barrel being defective with a tight chamber is nil. I do have to give them props for having great customer service and being willing to help. Wanna kill these ads? We can help!