Originally Posted by
d.winsor
I would not get the one from western powders, it comes with an o-ring to put under the primer. I think I remember hearing they wear out after about 16 shots......
The o-ring is just included as a helpful option, and if used, will reduce blow by. It isn't necessary to use the o-ring. The inclusion of the o-ring, with the breech plug, is like a bonus, and shouldn't be considered a detriment.