|
I had a Madbull spring in my MP5SD, bearing spring guide, airseal nozzle, 330mm tightbore barrel and was shooting 390-400fps, with the occasional one going over. I *think* this was with hop up off, don't recall. I did notice they are stiffer compared to the Prometheus ones.
A good suggestion for you is to get a Modify 100 spring, it's relatively spongy, I installed one (w/bearing guide) into a stock TM AK, and was shooting in the 360-370fps range.
|