No4 Rifle WW2 metal finish?

[Sentryduty]

I actually would consider it somewhat smooth with almost a "plastic" feel or texture in my experience.

I have 2 LE rifles that appear to have it applied, the 1943 No4 in my thread, a 1953 FTR 1908 No1 MkI*** my two other LE rifles have 1918 No1 smooth blued metal and 1944 No4 grey parkerized/phosphate which is a rough texture.