Originally Posted by ashf9999 Unless of course it's a commercial one, so may not have a number. Try Peter Dyson https://www.peterdyson.co.uk/acatalo...NRY_Parts.html Purchased one from Peter Dyson. Many Thanks for your help. It is apparently a 577-450 MK1 Martini Henry Cavalry carbine it is dated 1877 on the right hand side of the action.
If your ever stuck you can drill a hole in the end and solder an old bit of drill bit in there, grind it round and it works as a fix.
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