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im new to the forum ....glad i found it ...hope someone out there can help.... i have a sb ps90(cmmg barrel and can adaptor) with a .223QSM titanium can...problem is after firings 10-20 rounds(one per second) with the can on,gun loses accuracy(rounds 2-3inches off zero at 10yards) and then the gun misfeeds...the misfed round looks like the bullet has been "pushed back in" the cartridge...really strange looking... take the can off and all is well...this suggests abnormal increased chamber pressure(obviously one would expect some increased pressure with a suppressor, but this cant be normal)...the gun is clean and every thing looks good (ie looking down barrel through can) ...this happens repeatedly....normally i use ss195 ammo, but happens even with ss197 (requiring several more round to misfunction).....is this typical of suppressed ps90s? ...man i sure hope not .... hope someone has some answers for me...im stumped!.....thanks ....john