ronlaughlin

Ron the one on the left is what I have seen in other posts quite often, that is why I asked the qestion.

To me that indicates there is a sufficient amount amount of back pressure on the nose of the primer, to push it back into the bushing. Again in my little world that pressure and repeated firing and time would wear on the threads of the bushing if they were loose.

If the 'o' ring is used to absorb the pressure that could and might relieve the wear and tear on the firing pin bushing. So with that in mind increasing the size of the 'o' ring to achieve head spacing as MD is suggesting might work. It certainly is not any less effective than CVA's original design.

The primer on the right is exactly what I might expect from the longer V2 BP,(length and diameter of flame channel increases the volume of gas it can contain and relieves some of the pressure on the nose of the primer). You can still see the beginnings of the impression of the FP hole and the beginnings of the slot in the face of the firing pin bushing on the primer.

Thanks for the pictures... I was trying to dig some up from other web sights....