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Okay so I've found the problem: the full stock screw that screws into the spring guide. When it's tightened the fps is around 150. As I loosen it I can literally watch the fps rise the more I loosen it. When it is completely loose (as in putting no tension in the bolt) I get 290fps on a prom 90 spring...so about right. I did test this before but I think I didn't losen the bolt off enough.
I also noticed that when it's shooting properly I get a nice "thud" sound. When it's shooting low it's a much higher pitched snap. My guess is the higher pitched snap is from the air escaping between the hopup and nozzle at high velocities.
Now another problem: to get the gun to shoot right I need to have the bolt WAY too loose to the point where the stock wobbles. I think I may have to put a shim between the rear of the mechbox and the lower receiver so the bolt cannot pull the mechbox backwards. Any other ideas to fix this?
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Ronin 49 Team Member
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