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Gunsmithing TRG-42 Barrel joint

SSG Mac

Private
Full Member
Minuteman
Dec 29, 2007
8
0
63
Bluff City, TN
All,

I have been working on a TRG-42, and noticed what appears to be HARD debris at the top of the front action screw (and in the chamfer at the rear of the barrel) It looks like solder!?!
Does anyone have any idea what this might be? This appears to be the factory barrel, as installed.
Any help is greatly appreciated.