HW30S O-Ring Tune / Tune Kit ?

"wrhinehart"What on earth is an "O ring tune?"
Instead of a parachute style piston seal an Oring is adapted to the piston either by adding an adapter with a groove for the O-ring or machining an O-ring groove into the piston.
Here's an adapter from Vortek's site-quite a few springer field target guys use them.
Diana%20Oring%2028-250x250.jpg