Help ID Barrel, 20ga British? Lee Enfield?

[A Savage]

Anybody know what this is off hand? Acquired from a master gunsmith with a bunch of Lee Enfield barrels. Chamber and borer measure for 20 gauge, has lots of armory and proof marks appearing to relate to British military, about a dozen miscellaneous armory marks, two crowns and a set of hash marked it looks like an out of service.
Rear sight and bottom lug are part of barrel cast in. Front maybe part of the barrel or pinned in, I can't tell. I have it showing next to a Enfield in a couple pictures.

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[A Savage]

Enfield on right, mystery barrel on left.

 

[drstrangelove]

Only way to know is clean the heck out of the chamber and take a wax casting for measurement. Be kinda cool to have 20ga enfield repeating shotgun … especially on a light Jungle Carbine, but I imagine the bolt would have been modified. Any oversized head bolts? I wish we could ask Velzey. He knew everything.

 

[drstrangelove]

Enfield Model 1886, 20 GA, Shotgun

26" Barrel, Shotgun, SN B1850, Metal reblued, many handling marks, wood fit is poor, areas of rust and pitting, heavy use and wear, see photos for details

www.brianburkeauctions.com

BSA Australian Martini 310 Cadet Rifle

BSA Australian Martini 310 Cadet Rifle for sale online.

www.gunsinternational.com

Maybe? Martini design was British iirc

 

[A Savage]

I think maybe Martini Henry, I'll have to get measurements but it looks very consistent.