New member with question on 20 gauge Parker

[B. Dudley]

It definately appears to be new production barrels. Possibly reusing a few parts, like the locking lugs and such. But, there does not seem to be any sign of sleeving.
The rib does not look original to me. The font of the marking is larger and not correct style to be original. Also, the opening in the matting (for the letters) looks to be larger than normal. I think that the rib was just the barrel makers reasonable attempt at recreating the parker markings.

I do not think, off the top of my head, that Parker ever abreviated Meriden as "MER". Who knows why they chose to use ACME as the steel name on this set.