The problem is the patent breech on this rifle I am praticing on has a 16mm x 125 thread I cant find a replacement for it. going to go with a hook style breech . the cal is .45 what is the best size plug recommendations? smallest largest etc this is not a very thick walled barrel I think it measured 7/8ths .
the pat breech is beyond saving the place for the nipple is gone its one of the old style navy arms long rifles with the 2 piece stock and the large brass piece that puts the 2 stock parts together has RR grove Thur it.