[Deathfox]

My statement was bias, i personally dont believe in swiss cheesing pistons. Im weary on it because it does change structural integrity of the piston.
The gun in question never had a problem with it for 20k rounds, then he short stroked it and then swiss cheesed it and failed almost right away. So im still standing by my statement because the gun had no wear before those modifications... and those modifications would have made it less of a chance for for the "crashing problem" as you stated. So i still say its the piston bouncing off the piston head And causing a engagement problem. I would suggest a sorbo pad because this would keep it from "bouncing" off the cylinder head. This is a common problem in high rof setups, and you cant get the best of both worlds (FPS & RPS)

. Ive never found the need to use swiss cheesed pistons because i can manage to get 45rps on a single sector without swiss cheesing. And i get great piston life (with AoE)

But i will have to agree with ya on SHS metal rack pistons. They are great pistons (and cheap)