One of the Omega breech plugs i modified seemed to be allowing more blow back than i thought it should. I replaced it with another, and when i examined the replaced plug, i saw this:







I don't know if that worn looking area in the primer seat was there when it was new, or if it was made by some kinda flame erosion. Either way, a primer seat that isn't real smooth, uniform, and nice does allow 'blow back'.

The unaltered new breech plug now installed in the Omega has much less 'blowback' than the one pictured. In the future, i guess i should examine all breech plugs before i modify, or use them, and if they don't have a nice clean uniform primer seat, they will be returned. If this area on the pictured breech plug is from usage, not milling, i guess, perhaps, one should be using o-rings to increase the longevity of ones's breech plugs.