Hello
I'm building my P90 from a well shell.
I put a re-enforced matrix echo1 from
www.evike.com
When I shoot I feel a lot of air come out of the front of the gun compared to when it had the plastic gearbox. But when I check the fps... it went from 240 to 157. I also notice the gun shoots all over the place....
Did I need to do anything to the mechbox before installing it?
Thanks