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RX93 · July 29th, 2016, 22:03

I recently bought a CYMA P90, which was working out of the box. After I changed the spring for a Modify S90 to lower the FPS, the gun will either not fire, or fire 1 bb every 10 or so shots that goes about 20 feet then drops. The gearbox works when out of the gun (I can feel it pushing out air) so I don't think it's a compression issue.

My guess is that it's something to do with the hop up unit/inner barrel, but I don't have any spare parts to check that.

UPDATE: I got it working. The issue was that the air nozzle was not seated on the groove on the tappet plate, so a proper seal between the hop up and the gearbox was not created when the trigger was fired (it was seated before when I incorrectly put the gearbox together)

July 29th, 2016, 22:03	#1
RX93 Trader rating Join Date: Jul 2016 Location: Trenton, ON	CYMA P90 not feeding/firing I recently bought a CYMA P90, which was working out of the box. After I changed the spring for a Modify S90 to lower the FPS, the gun will either not fire, or fire 1 bb every 10 or so shots that goes about 20 feet then drops. The gearbox works when out of the gun (I can feel it pushing out air) so I don't think it's a compression issue. My guess is that it's something to do with the hop up unit/inner barrel, but I don't have any spare parts to check that. UPDATE: I got it working. The issue was that the air nozzle was not seated on the groove on the tappet plate, so a proper seal between the hop up and the gearbox was not created when the trigger was fired (it was seated before when I incorrectly put the gearbox together) Last edited by RX93; July 30th, 2016 at 14:17.. Reason: Fixed issue that the tread was made to fix