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.

[Rory]

Sorry,bit late but just seen this. Is the leak from the port or the threads? I have had lots of success (luck) with gbb mags by soaking valves/exhausts in mineral oil (rockshox mtb suspension fluid) and then using PTFE  tape on the threads when reassembling. Also try soaking the o rings in silicone oil or similar overnight before installing 

[Lyndication]

TM o-rings are nitrile, they don't absorb silicon oil

[snowy194]

Try using power steering fluid (from Halfords or eBay) to rejuvenate seals.

 

Nitrile might be similarly resistant to it, but it used to work wonders on regular seals, far better than silicon oil alone.

 

M

[KirbyHCI]

I recommend a blood sacrifice to whatever deity you believe holds dominion over mechanical contraptions of wargames.

That, or consider if the body is minorly damaged in a way that compromises the shape of the sealing areas in the metal itself, even if minor. I dropped a brand new MWS mag once and it never held gas again even after 3 professional repair attempts due to an imperceptible bend of the overall vessel compromising a seal somewhere even with fresh fully greased seals/o-rings/etc. - Was a right bummer!

Also Rory's question is good, where exactly is the leak... And how heavy is it's perio- I mean flow? Maybe vid'ya a water or soap bubble test or something in case that might help others diagnose it remotely with ya. TBH in my case after multiple self-repair attempts and several professional repair attempts, I just gave up on my busted MWS mag and replaced it. But, won't hurt to try copious amounts of thick ass grease, PTFE tape, and a ritual sacrifice of small children to the gas gods at a sacred skirmish site on a blood moon at the strike of midnight in the mean time before giving up, I'm sure.

I'm also be keeping that power steering fluid suggestion in mind my dang self