Prometheus MS90 Question
 

I just installed a prometheus MS90 on my Umarex 416 and it's shooting pretty consistently at about 300fps. I read online that its supposed to be around 330-340fps. Do you think I have an air seal issue or is this just how this particular spring works in my rifle? I'm making this my indoor gun and want it shooting below, but close to, 350 fps. I tested with both a 9.6 1600mah mini nickel and a 7.4v lipo.

Sounds about right...MS100 is about 340-350

Sounds right to me. I have an MS90 in my C8A3 and it shoots a steady 310fps through a tightbore.

+1, the MS90 is 300, the MS100 is 345

Awesome, thanks guys. Looks like I'll be buying an MS100!

Is this for CQB? because if you actually do the math there's pretty much no difference between the time it takes for a BB going at 270 FPS vs. 330 FPS to reach a target at "CQB distances". Just stick with the MS90 if you're setting up a CQB rifle.

Yes, I will mainly use it indoor but I do plan on using it outdoor as well, which is why 300 is a little low for my liking. Although I guess I probably could've just got a higher spring for outdoor use. Oh well, I already ordered the MS100 as I thought it would be a good balance for both indoor and outdoor so that I can avoid constantly opening up my mechbox.