I have a nice little martini metford artillery carbine, nice except for its chamber is a trifle loose so hot or normal loads back out and jam the block, and it’s foresight blade is mostly missing. Additionally it has a rather tight bore and groups surprisingly well....

How would one go about replacing a foresight blade?

Any thoughts on the chamber, it is fine with black powder but typically gets sticky with anything over a minimum load of smokeless, commercial ppu had it home in a vice being tapped open. It is marked D.P. I am guessing on the strength of its chamber, which I’d say someone tried to polish some pitting out of.
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