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My MP5K H&K does brass that way ..more so when it is really really dirty ..likely the owner does not know the proper maintenance procedures as he is way past a chamber servicing ..he will shortly as it starts eating extractors and ejectors especially ..pick up the brass in 99% of the cases as the civilian 9mm ammo does not have enough pressure to "fireform" the ridges and the true machine gun military ammo brass case which have higher pressure also have thicker cases so they as well will not fire-for the ribs
Bear
 
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