Question about barrel stamping

[fahnenschmied]

And a parting shot...the entry pipe could also be an original part. It has been filed slightly octagonal...when...hard to say, but I would think that was a later alteration. The one rammer pipe is also similarly shaped.
Also a shot of the buttplate, rifle shaped but with odd screw placement, and also a crappy profile, showing the rifle-like lines it got when restocked.