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That may have more to do w/ the powder used your ammo. That was already commented on by the builders of .45" DI carbines - 9x19mm commercial ammo is dirty.
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Quoted: These are really fun guns and I highly recommend you snag one if the opportunity ever presents itself!
SIG proved with the MPX that gas-operation is possible, but they blew one of the big attractions IMO which is clean operation. Dang MPX is dirtier than my blowbacks
That may have more to do w/ the powder used your ammo. That was already commented on by the builders of .45" DI carbines - 9x19mm commercial ammo is dirty.
its called the stoner gas system.
yes, the guys that make 9mm gas operated AR carbines note that when you run WWB ammo or similar it is very dirty, more so than in other hcamberings for some reason. I suppose high quality defensive ammo is different, I hope. I assume the MPX has a piston over hte barrel? Even if you have a setup like that, lots of smudge comes back from the chamber I guess.