The thing that makes refinished rifles stand out is that all the parts are the exact same Parkerizing color shade. Original rifles were always assembled from parts that had been batch finished, so we expect an original rifle to look slightly mismatched.

Gas cylinders are stainless steel, & they do not take Parkerizing. (At least, they didn't during WW2 & Korean) There's a guy (IIRC, advertises in the GCAicon Journal) who repaints them, & does excellent work.

Neal