I bought a PC 9 Shield because they had a used one at my LGS. I don't notice a difference in the noise level at my indoor range. However, once someone in the lane next to me asked what I was shooting because they found it so loud. Maybe because some of the flash and blast comes from the ports laterally. I think the front sight getting dirty and the PC being hard to clean are non issues. I can understand that retention shooting could be dangerous. A friend who owns a standard model Shield shot my PC and said the trigger is noticeably better. It has operated flawlessly and I'm pleased with it. Some manufacturers of plated ammo labeled FMJ like Federal Champion label it not for use in ported barrels. I really could do without the ports but don't find them a problem.
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