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KWA LM4 PTS - PMag Leak

LM4 PTS PMag leak

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#21 okay47

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Posted 13 February 2014 - 07:30 PM

Try the paste first.  If it doesn't work then it won't be as big of a deal to apply rtv after

#22 General Pickle

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Posted 13 February 2014 - 09:05 PM

View PostBeachEMT, on 13 February 2014 - 01:48 PM, said:

I've been using froglube with no luck, so I think I need something more drastic.

Pickle- I just want to double check on the procedure. 1) Clean parts with alcohol. 2) Apply gasket maker to the base plate and mag body (parts #6 & 7). 3) Assemble the mag back together as normal. 4) Give 24 hours to cure.
That is correct. I put a nice coat of the stuff on the base plate, then put the original gasket in place to ensure it gets seated correctly, then put a coat on the top of the gasket and outer edges of the base/gasket, then assemble everything like normal. I suppose you could put the polymer shell back on too with the loading spring and follow etc. but I usually leave it off until it's fully cured and tested just so that if it fails I don't have to take it all apart again.

#23 BeachEMT

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Posted 25 March 2014 - 08:36 AM

Hey all, I just wanted to give an update. I put FrogLube paste on my mags yesterday afternoon and so far so good. All four of them seem to be holding pressure. So far I'm very impressed.

#24 netpoc

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Posted 25 March 2014 - 03:03 PM

Good to hear!

#25 BeachEMT

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Posted 22 February 2015 - 05:49 PM

Since this still seems to be the most appropriate thread, I'll revive it. Sorry to all those offended. I've tried various different methods to stop my PMag bases from leaking (silicone, frog lube liquid and paste, rtv black). I'm getting tired of constantly fixing the mags. Does anyone see a problem with JB Welding the base shut? I've been reading on some plumbing forums that JB Weld actually makes a really good air-tight seal. The only reason I can think of to remove the base plate would be to service the gasket. If I've removed the gasket, I should be able to do all the necessary maintenance removing either the valve or fill valve.

#26 niko_gpsy

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Posted 23 February 2015 - 07:15 AM

I have had some pistol mags that I could't get it to stop leaking at the base.  Ultimately Black RTV did the job and I am surprised that it didn't work for the Pmag.  JB Weld just seem to be such a permanent option whether it resolves your issue or not.  At this point I am sure you just want to try anything. :)

#27 BeachEMT

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Posted 23 February 2015 - 07:27 AM

Maybe I did something wrong with the RTV black. Did you remove the OEM gasket, or did you apply the RTV around the gasket? How long did you let it cure before you gassed it up?

#28 niko_gpsy

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Posted 23 February 2015 - 08:23 AM

I left the gasket in but I cleaned the gasket and base very well with alcohol before I applied the RTV.  I applied the base where the gasket sits first then slipped on the gasket and added RTV around the gasket and base.  After application I reassembled the mag and I left it for a few days before I charged it up.  It seems that for me there was leak under the gasket and this seemed to do the job.

#29 BeachEMT

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Posted 23 February 2015 - 09:55 AM

Thanks I'll try that procedure. My mistake may have been that I tried to do it without the OEM gasket. I thought that the RTV might be able to bridge the gap on its own and might be hindered by the gasket.

#30 niko_gpsy

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Posted 23 February 2015 - 12:45 PM

I think leaving the gasket in there will make a big difference.





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