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April 22nd, 2013, 23:10 | #1 |
Privateer Airsoft
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G&G UMP doesn't like it's receiver
Have a UMG with a weird problem. When the gearbox is by itself, it cycles fine. But once I put it in the lower receiver, it's completely dead. No click, complete electrical failure. Occasionally I'll get one shot as soon as I put it in, but it always stops working again. Works 100% of the time when the gearbox is not in the body.
Nothing appears to be obstructing or pushing on any wires. Ideas?
__________________
I change primaries like other people change socks. |
April 28th, 2013, 10:50 | #2 |
Maybe the motor height needs to be adjusted?
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April 28th, 2013, 13:18 | #3 |
Did you re-shim it recently? The lower receiver might be a tight enough fit that it's squeezing on the sides of the mechbox to cause binding. I had that problem with my Systema v2 box with an original Systema M4 metal body. MadMax helped me to diagnose and fix this many, many years ago.
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April 29th, 2013, 00:12 | #4 |
The ump uses a v3 with a motor cage motor heights not gonna matter cause its going to be the same out of the body and in
Try moving the selector plate around also if I remember the ump uses old style tm based selector with the copper band. See if that's not burnt out. Last edited by sushicake; April 29th, 2013 at 00:15.. |
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