Quote Originally Posted by deejayuu View Post
Thanks for the input. The seals need replacing but the exercise was to compare springs so assumed the
seal would not change that. Probably wrong?

Can you elaborate on the efficiency from figures shown?
The muzzle energy appears currently broadly between 25% and 30% of the energy made available to the piston. A 25mm HW77 should be nearer 35% to 40%, if not more, depending on the spring and preload.