Is the patent breech on Interarms half stock rifles essentially the same design as the Thompson Center breech? A counterbored plug with a flash channel connecting to the nipple?
The chambered breeches are similar enough that I have observed that all have a counter bored plug with a flash channel to the nipple seat. Some flash channels have more of an angle towards the nipple seat. With all of them, we have to make sure we keep fouling out of the flash channel and the powder chamber in the plug.