Not sure. A few shots ago I noticed crystals in it after it got a soaking so I ran a pull through through it to make the holes in the baffles round again.
But about 20 minute before that shot the gun did fall over into the wet dirt (on its side) and I never checked the muzzle. Guess I will never know. Certainly not blaming the product. Its had a lot of full house 300saum, 270wsm and 6.5prc through it and its a Mk1 so a few years old.
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