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- Joined: Thu Apr 20, 2017 5:47 pm
- Country: USA
- Location: AZ
If you shoot and clean regularly, most likely you will see this after flash hider removed:Removing flash hider to mount my silencer and saw this. The blue-green residue is most likely copper fouling that solvent has removed. No biggie just clean it with a good scrubbing and any of the name brand Copper Solvents. Regular powder solvent won't take it out.
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