Having just picked up a 25mm Hw77 piston from Mach 1.5 Thanks mate, I was thinking about reducing the weight of this piston, but how far could I go before it becomes unviable to produce decent power, starts to slam or bounce upon firing

I would also like to do this with an Hw80/85 pistons, I know there are a lot of rifles with over heavy pistons, so no matter which rifles piston you may have done this too, I'd like to hear your thoughts and what weights you ended up with on the pistons

ATB

John