Breech plug questions

[Ky-Flinter]

I probably just need to wait for that "Ah-ha" moment to happen, but I'm not seeing the advantage to threading the outside of the barrel, and making a "cap" to match that will screw on over the outside of the barrel.

Doesn't the distance from the outer barrel flat to the bore or chamber wall remain the same either way?  

-Ron

[Ky-Flinter]

AH-HA!  I think I get it.  With a "female" cap, the flash channel will be the distance from outer barrel flat to the bore, but with a traditional plug that is counter-bored you have the additional thickness of the internal beechplug wall to go thru to reach the counter-bore (since it is smaller than the bore).

 Seems like a LOT of work, for a little gain.

-Ron