ACS bolt

[NB_Hacker_NB]

Originally Posted by nitrobassboats

thats the spring i use with a shocktech shim kit silver to get it down to
280 fps and also the black valve spring

I ment with the stock bolt.

[NitroBall]

In a real world, i cannot see how changing a bolt can make such a difference in FPS .
From 210 fps to 385 fps ?
is the chrono reading and working fine ? 175 fps difference ?

[Hob Hayward]

Hmm just a theory, but how long have you been using the ACS? I'm thinking if its broken in too much the spring depresses due to inertia, the front staying back, and thus the air not going directly onto the ball?