CA m15 has lost alot of power

[flavourshaker]

My mates bringing his classic army m15 round later for me to have a look at. It used to shoot about 320 fps but he's complaining it shoots no way near that. Its had a new piston fitted recently so im guessing it could be something to do with the piston head causing poor compression rather than the spring.
What do you guys think?
Cheers

[tubzza]

Re: CA m15 has lost alot of power

I had the same problem,
It was the fact that the tappet seems to break when you put the gearbox back together and causes power loss due to lose air nossle.
Have a look it might be different