I'll be honest, I didnt expect a doormat I bought one late night a whim because I got a laugh out of it would of caused some autist anons to get in a banter on the theology behind it, but here we are. I guess.

Anyways, here's a piston inside a gasblock. Above and below the gas block are rubber cork pads, with below it I experiment with various thickness shims between .002"-.015" to change the tension of the barrel and how it effects my 100 yard groups.