Blue Residue on Crown/Flash Hider Area

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e292644
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If you shoot and clean regularly, most likely you will see this after flash hider removed:
BarrelFront.jpg
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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