TM MP7 GBB

[DrFumbles]

Hi guys,

 

I recently picked up a second hand TM MP7 with 5 mags. One is leak free but the others all have leaks.

 

I've tried using a silicone lube on the o rings to no effect. I've replaced the o rings with new ones and I still have leaks. 

 

I read online about using a silicone gasket maker so I've tried that on one magazine and let it cure over 24 hours, tried refilling with gas and it still leaks.

 

I'm kind of at a loss on how to salvage/repair these magazines.

 

Any help or advice would be appreciated 

[BigStew]

 It could be the valves then selves need rebuilt or if the guns been run on green gas they may be damaged and needs to be replaced.