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Old 02-05-2013, 12:40 PM
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Nytemayr Nytemayr is offline
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Post upgrade G&G M4 gearbox lockup

I just upgraded my stock G&G Combat Machine 16 Raider with a Matrix M115 spring. When I fired it, the gun barely cycled the first time and locked up the second time. As I was taking out the stock bolt, I heard a click, like something had released, so I test fired it again. It fired multiple times but sounded a little rough. Every time I tighten the stock bolt down all the way it won't fire and when I unsrew it a little bit, it will fire. Any hints?

Gun - http://
Spring - http://
Battery - 7.4v 1200mAh 15-25c Lipo bought @ 321Airsoft a month ago
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Old 02-05-2013, 01:14 PM
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the order you reassemble your gun can sometimes cause the gearbox to jack up which can push the motor out of alignment especially if the grip isn't aligned with the motor. The adjustment screw needs to be centered. My suggestion would be to assemble the gun in this order.

Rear body pin, mag-catch, rear stock (while putting on the rear stock push the mag-catch if its getting resistance your gearbox is jacking up a bit, as soon as you get resistance stop screwing in the stock), then start screwing in the grip until the mag-catch feels like it goes in and out freely, use that mag catch as your guide to see if the gearbox is getting jacked up too much or too low, it will show as resistance on the catch. tighten and and loosen screws in the stock and grip until everything feels secure, then put in the motor and end plate to the grip (make sure to align them), magpul grips are the easiest to do this with because you can unscrew the motor height screw and see if the motor shifted... other then that, maybe bad shim job?
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Old 02-19-2013, 01:11 PM
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SOLVED! The spring guide was not aligned. !Mods please delete!

Last edited by Nytemayr; 04-17-2013 at 07:48 AM. Reason: delete
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g&g m4, gearbox, problem, spring

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