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"Non fired round would not extract, ergo, head space way to loose"

Sorry, I don't get that. If the round didn't fire then the case didn't expand. So why no extraction? Chamber too tight?
Or is...

Spontaneous reaction: "Is this an 1839 or later pattern?" - It's not a pattern carbine of any kind.

1) The hammer is in a French style, similar to those used on the French musket conversions.
...

"from the looks of it someone may already hit that receiver with a torch. You can see the discoloration from heat. If they did, the temper may be in question."

"sold for $130 on gunbroker."
...

Try this link

Historica-Shop.EU | Feinwerkbau GmbH

MfG and a great New Year - it's got to be better than 2020!
Patrick

Agreed. The wood should retain some elasticity.

ssgross, you really put it quite well here:
"My objective is to preserve all the dings and service life, but look and feel like a rifle in service, carefully maintained by a soldier or marine whose...

Do I see a ROCCA ON THE COCKING-PIECE? - if so, then it is a subcontractor's stamp from WWII. Could be a replacement part.
If it's ROSCA, I haven't a clue!

If it is a Finnish M-N, maybe that is a birch stock? How about a close-up of the wood?

Whatever the wood - remove the plastic crud and oil it with the very finest linseed oil you can obtain.

"I'm having trouble with someone getting film developed that had a photo of a battleship during wartime and there not being any consequences, at least confiscation of the photo. Second to that is I...

OK, it's an "Iron Duke" after all!

I was mistaken with Canada - the derrick in the photo is in front of the rear funnel, whereas on Canada it was behind the front funnel.

It's an "Iron Duke"...

One the other hand... covering my bets;)

Could it be an Iron Duke with an altered rear mast? The trouble with identification silhouettes is that many WW1 survivors were modified later. One really...

None of the Above!

HMS Canada. a.k.a. Chilean "Almirante Latorre"

Chilean battleship Almirante Latorre - Wikipedia

Silhouette is similar to the Queen Elizabeth class, but the rear mast is...

"a good smith would have drilled from the inside the receiver well or from the butt and inserted a rod."

I have repaired such different rifles as an Anschütz 54 and a Westley-Richards monkey-tail...

Actually, I think it's BeO, not DeO.

The loop on the supposed D is discontinuous, like a 3.

Not that I have a clue what either of them could mean...

Maybe this link is a clue?

Centre Union - Wikipedia

Of course, the trouble with acronyms is that they tend to be ambiguous!

"I am fairly sure that it was actually AJ Parker rather than Parker Hale (competitors) who made the M80".

Promo, Alan de Enfield is demonstrating British understatement. One can see in your photo...

My information is that only 2 genuine Trapdoor pistols were ever made. And they are both in museums.

Anything else is a "bitsa" made up from surplus parts for fun, film or fraud.

For instance:...

"Swapped" sounds like a deliberate action. So in the sense of bolts being deliberately mixed up - I doubt it.
But accidentally mixed up as a result of bolts being shipped separately from the rifles...

A photo of the barrel channel would be helpful, as you are likely to find a more natural wood surface there.

"My understanding is that the muzzle should be centered in the nose piece opening."

Well it certainly should be. Check the fore-end wood. Maybe it's warped downwards. Although I generally agree...

Where is the breech-block axis pin? Cocking indicator has been removed. What happened to the axis? Some serious fudging seems to have been carried out here. In this context, the all-too-crisp crossed...

"How would you suggest to call it in German?"

A very good question. I'm puzzled as well. It's one of those cases where a 1:1 translation doesn't really exist, as it depends on the application....

I would define it as follows:

If the protruding threaded end of a screw has been spread in order to prevent it coming loose, then that is peening.
If the metal surrouding the screw head looks as...

"I'm betting the whole thing was red hot and then they quenched it in a pail of water. "

- Which could mean that the steel is now partially glass-hard where it was fully quenched, varying to...

Looks like it's one full turn short of being properly breeched-up.
- See 3rd photo in 2nd row.