M1 Garand gas cylinder

[browningautorifle]

That one looks like a well used one to begin with. The lines inside are from a man twisting something back and forth. The whole thing looks sandblasted.

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[MadMechaNick]

The lines actually look outwardly formed rather than indented into the cylinder, if that makes sense? Also, you're thinking this gas cylinder was blasted, re-parkerized (its a bit green) and packed in storage grease? Thanks much for the reply!

That one looks like a well used one to begin with. The lines inside are from a man twisting something back and forth. The whole thing looks sandblasted.

[browningautorifle]

The lines actually look outwardly formed rather than indented into the cylinder,

They look like scratches.

[MadMechaNick]

I'll post another photo. They arent scratches, but outward bumps in that pattern.

https://imgur.com/a/JKkacJv

They look like scratches.