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The blueing is coming off. The entire line of sig 550-556 do the same thing I found out, unfortunately after my purchase. I even was in contact with Sig about it, they do not cover it under warranty.

Thanks,

I was unaware that the design allows extracted shells to hit the extraction port/side of the receiver, effectively removing the rifles blueing. Since I do not want a rifle which is going to start rusting itself out over time, I am currently selling it on gunbroker. It's a bit heavier in the front due to the piston design, i'm sure the HK 416 is going to be the same way. I am going to hold out and hope assault rifles don't get banned by the next president before the 416 comes out...

Pair of Mosin Nagant m44's, both 1944 Tula's


Yugo SKS & 1938 Tula M91/30


1940 Mauser 98K, Berlin production


Sig 556