and no as far as i know they don't exist but then hey you don't need one! the pressure that the shocker bolt applies to the ball is not normally enough to chop...i have never had a break and i have heard many other shocker users claiming no breaks...
Hope this helps!
I set up a small block in the breech for a ball to sit half chambered. Then i pulled the trigger 13 times slowly before it broke the ball. I tried with a fresh ball(after wiping it all of me) and pulled the trigger very fast and on the 6th rime it broke the ball...hows that then