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Posted: 6/17/2009 9:36:06 PM EST
I found some really odd blue/turqoise type stuff on the muzzle end of one of my AR's barrels today, basically along the outside of the crown. Its all along the inside of the flash hider as well, anyone know what this might be?
Link Posted: 6/17/2009 9:47:38 PM EST
it's corroded copper from the jacket on your rounds.
Link Posted: 6/17/2009 9:52:16 PM EST
is it bad for the barrel?
Link Posted: 6/17/2009 11:05:54 PM EST
Link Posted: 6/17/2009 11:35:05 PM EST
you said its on the outside right? thats somewhat normal. it dosnt happen all the time but with some types of ammo and esspecially when I dont clean the rifle for a while I notice it. its just copper that possibly gets vaporized and condenses on the muzzle. if not then its copper that comes out with the carbon fouling during firing that builds up. I most usually notice it on the piston in my M1.
Link Posted: 6/18/2009 1:09:16 AM EST
The blue residue is oxidized copper. It may be from solvent that carried the copper to the muzzle. It really won't hurt anything and can be cleaned off with a decent bore solvent.
Link Posted: 6/18/2009 2:38:32 AM EST
Link Posted: 6/18/2009 3:27:27 AM EST
Maybe it's the "kool-aid" everyone keeps talking about.

It's not a Colt, is it? Those damn things are, apparently, DRIPPING with the stuff.

Link Posted: 6/18/2009 4:37:01 AM EST
Hey buddy,

You should look for Smurfs w/flash-hider shaped marks on them. If you can't find any, then... the other guys are right

Took me a while to figure that out w/mine.

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