the bevel gear doesnt cause loss in FPS, all the gears do is pull the piston back, its the spring, spring guide, piston, piston head, cylinder head, cylinder, air nozzle, hop up chamber, hop up sleeve and barrel that affect your shot. If its a full auto problem you AEG may be firing too quickly (firing a BB while the first one hasnt left yet). best thing i can think of without handling the gun is make sure everything is in the right place, and the hop up sleeve isnt damaged.
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