Suppressor, pieces of brass after shooting

[zippy23]

Shot suppressor today, Omega 9K through a P10C and a P-01 omega. No issues with function. With the p-01 there was twice where I though a piece of something maybe hit me but wasnt sure. Got home, cleaned the gun and the suppressor had some rattling noises, I shook it out and there were a few small pieces of brass, very small and some small dark pieces. Inspected the inside of the suppressor, looks fine. Baffles look fine, dont see any chunks taken out. There are maybe 80 rounds total through the suppressor. There was one time that the suppressor was kinda loose so i tightened it back up on the p-01. If a bullet contacted a baffle i would imagine a seriuos issue would happened. Anyone experience something like this?

 

[Hop]

Probably a baffle strike that sheared a little copper jacket off the bullet.

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[Dead Duck]

Did you check your spent brass?
Anytime I see any small metal pieces I think of "Primer Pops". Just the center chunk of the primers will pop on out. Like someone drilled them out.

The worst I've seen was with some old 80s Norinco 5.56 ammo. The gun I had was an Aussi Arms "Tasmanian Devil" and the primer pops blew back into the bolt through the firing pin hole and clogged up behind the pin just enough to go full auto. Slowly at first then, I had a machine gun..... until I cleaned it out. Hundreds of them over flowing into the lower and spilling out.