Well, the pistol is 100 years old... The part is hardened which may relate to it's color. Sometimes hardened parts chip when they are brittle.
If the GECO is NATO power (made for machine guns) it could well be doing damage. If standard velocity, could relate to the gun's cycling balance and the state of the recoil spring.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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