Thanks!I recommend that you try punching them out and putting in new ones, but they should be a tight fit or else there won't be an improvement.
If you get that far, slather the end piece and the end of the inside of the cylinder with the strongest Loctite you can find, then assemble everything and peen over the ends of the pins with a hammer.
I did something very similar to a cylinder on a customer's rifle, and it worked very well after a few thousand rounds at high power he said.
Idk how long term is, but that's long term enough that I'd recommend it to you.
Where would you recomend sourcing parts?