Springer muzzle blast

[evert]

HTH - JB

Thanks!
Your words "barrel pressure at the time of exit" has to be the correct place to start investigating.
I'm not confident that its easy to pinpoint the exact effect, but your ideas helps to organize my thinking a bit better!

In the 77k theres less preload with the spring giving 11fpe than the FAC spring, and the recoil is quick, but not sharp.
With the OEM/FAC spring, the recoil feels a bit more "restricted", indicating to me that there may be a bit more bounce.