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There's an allen screw on the bolt at the back, it's a velocity adjustment screw. When I first fired the rifle it shot 400fps. I adjusted it slightly and suddenly it's shooting 415. Consistency was pretty good considering it's propane. I toned it back down to 400fps. When I first found out about it, I had unscrewed it a bit but didn't have a way to test the velocity. Even so, I do intend to convert it to HPA. Beyond that, it needs a new barrel. the current one is bent and is useless.
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