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PMAG Easy Maintenance Mod

PMAG pmag Pmag maintenance

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#1 BeachEMT

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Posted 25 June 2014 - 08:48 PM

Hey everyone,

I would just like to share a mod I came up with while talking to uscmCorps. The goal is to allow for access to the PMAG's gas valve without removing the shell. This is compatible with current generation LM4 PMAGs, and I believe it should also work with future LM4 polymer magazines.

Here is what the final product looks like:
Posted Image

Here are the tools I used:
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From Left to Right: Dremel cut-off wheel, Dremel sanding drum (small), Dremel milling bit (approx. 3mm), and Dremel.

First hole I made was on the right side of the shell, just above the mag catch cut-out. This is to allow part #30 to be removed with the shell still on. It is a simple operation. A drill press is handy if you have one. All that needs to be done is to drill a 3mm hole, 9mm from the top of the shell and 6mm from the back edge.

Sorry, it was hard to get on camera. Here's the pilot mark:
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Finished hole:
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View of part #30 through the hole:
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Finally, a large hole needs to made around to valve so that the wrench can fit. The hole needs to have a radius of 12mm. It intersects with the sides of the walls of valve cut-out at 4mm and 14mm below the top of the shell. For good measure I also shaved the back wall smooth above the opening. The milling bit was used to open up an initial hole and then used the sanding drum to open it to the final size. A cut-off wheel was used to smooth the back of the shell.

As before, I marked the cut beforehand:
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Final hole:
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Please pardon that the hole is not super precise. I didn't feel like doing the math on the points of intersection, so I just kind of winged it.

Another thing I would like to mention because I feel like someone is going to bring it up; won't part #30 fall out? I spent a good 5 minutes holding it right side down and forcefully shaking it. The pin didn't even budge. Also, it will be supported by the magwell while in the gun, and pouches while outside.

Hope you guys enjoyed. Thanks for reading :thumbsup:

Edited by BeachEMT, 25 June 2014 - 11:45 PM.


#2 uscmCorps

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Posted 26 June 2014 - 12:05 AM

Very cool. Nicely done.

#3 crowley

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Posted 26 June 2014 - 04:37 AM

"future LM4 polymer magazines"

What does it Mean ? Updated PMAGS ? When so, please Kwa...make the lighter ;)

#4 PJ-P09

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Posted 26 June 2014 - 03:56 PM

View Postcrowley, on 26 June 2014 - 04:37 AM, said:

"future LM4 polymer magazines"

What does it Mean ? Updated PMAGS ? When so, please Kwa...make the lighter ;)

I think he is refering to the PTS EPM they just released an AEG mag and i hope soon they reveal a gbb version of the EPM

#5 uscmCorps

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Posted 26 June 2014 - 05:27 PM

Out of respect to KWA I can ony comment on the PTS LM4 PMAG which is a joint collaboration product between the two companies. Sadly, that is discontinued/no longer in production. That said, I've always had a fondness for the KWA LM4 STANAGs. They were slightly lighter and held more rounds than the PTS/KWA LM4 PMAG. I wouldn't hesitate to use any of those.

#6 BeachEMT

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Posted 26 June 2014 - 09:15 PM

Guys, this isn't a discussion about possible future polymer magazines. I'm not affiliated with KWA, nor PTS, and I don't have any information to tell you about any future magazines. There are two reasons that I even mentioned compatibility with future polymer designs. First and foremost, I want to make sure people know this mod isn't obsolete even though the PMAG has been discontinued. Additionally, any new design will be similar to the PMAG by virtue of the fact that KWA has already gone through the design process and that was the best way they could create a polymer mag. Yih Kai already has the tooling all made for the PMAG, and the only offending components are the shell and base plate. There's no reason for the shell and baseplate not to be redesigned and the rest reused. Sorry for getting everyone excited over nothing.

Edited by BeachEMT, 27 June 2014 - 07:41 PM.






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