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That defintely is an SGW barrel, whether it is safe or not I am not qualified to say. I know the gov't had contractual compliance problems with the quality and the word years ago was that lawsuits followed after production.
If it is a GI barrel, no it will not have a short chamber, the NM specifications for #7791362 are very strict and none would be accepted.
From your description it sounds like somebody reparkerized the barrel. GI barrels are held in leak proof fixtures that prevent any solution getting in the bore.
If you mean machine marks as the rough chamber, no way, machine marks would be reason for rejection of an NM barrel.
If it is a GI barrel, no it will not have a short chamber, the NM specifications for #7791362 are very strict and none would be accepted.
From your description it sounds like somebody reparkerized the barrel. GI barrels are held in leak proof fixtures that prevent any solution getting in the bore.
If you mean machine marks as the rough chamber, no way, machine marks would be reason for rejection of an NM barrel.