Need help identifying an M1icon garand cylinder please! Bought as NOS USGI in the grease. Seller said he believes post war Springfield. Has only the W or M mark on top of the rear ring. No obvious staking of stacking swivel screw. Kind of a dry looking parkerizing when storage grease wiped away. Weird squiggly lines in the cylinder that look to be outward into the cylinder not indented. Would this affect performance? Thanks in advance!!!

https://imgur.com/a/rsKbtAc
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