Acceleration is definitely a bit slower than planned. about 20% less than my TX for example. Good thinking. Should be easy to test too as as I can just run the single working piston, half the weight and double the acceleration. Unfortunately I don't have any stiffer springs, so might need to do some spring shopping.
I've had big air leaks from the breech seal, and the breech plug so far. Both of those are sorted, but I'm not ruling out piston seal issues just yet![]()