I was measuring while you were typing I think. The Bowman ring I have seems to be a tad bit larger in diameter (I was squeezing just tell the ends touched, so this may be off a little), but MUCH thinner in width, and a tad thinner in thickness. It feels very weak compared to the stock one.

Jody, thanks for the reply. I just measured the cylinder and piston and they're extremely close to what you quoted. I think the issue is the ring. Like I said, I'll put the stock back in and see if that changes anything.