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LM4 PMAG Rounds Remaining Indicator Mod

LM4 PMAG mod rounds remaining

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#1 Jeffsworkshop

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Posted 28 June 2013 - 12:31 AM

Hey Guys, I want to  share something I came up with after encountering situations in games where I would run out of ammunition in the middle of a breach or enemy push. A "Tactical Reload" might be useful here but more then likely you would want to reload when you weren't being fired upon.

The problem is that you have only a rough gestimate of how many rounds you have remaining in your magazine, even if you do pull it out, you could only see maybe up to 3 rounds from the feed lip. Do you reload to a fresh mag or not when it's time to push?

My first solution was the most crude and basic; To simply drill holes in the PMAG polymer shell:

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Which would look like this when inserted into the magwell:
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This solution had both pros and cons;
Pro-
Simple and foolproof. Nothing to potentially jam.
Cons-
Potential contamination of dust and debris from the environment into the magazine.
Once inserted into the magwell, only 2 holes are visible. The most crucial indicator holes near the top of the magazine are blocked, so a manual remove-check-reinsert are needed.

So that was my first idea.

Getting inspiration from real steel magazine designs, such as the Magpul Maglevel, I came up with a much more refined execution of the first solution...

At 30+ Rounds remaining-
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at 15 Rounds-
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and at 5 Rounds-
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The indicator colours "tick" in real time as rounds are fired, and during colour transitions a very good estimate of rounds remaining can be obtained at a glance at the indicator.

So again some pros and cons:
Pros-
Very good estimate of rounds remaining.
Indicator visible even when magazine is inserted.
Indicator hole is mostly sealed against the environment.
Looks pretty sick?? :dribble:

Cons-
More laborious then the first method.
"potential" for complications.

Having used this modified mag in numerous games and home testing, I have yet to encounter a malfunction caused by this mod. But bear in mind that this is a mechanical solution, and it has a higher chance of failure then something that has no moving parts, even though the likelihood of said failure is extremely small.

Oh and here is where the magic happens: B)
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If you don't like to use colours, you can draw any symbol or numbers on it to customise the indicator.

Thanks for reading guys and gals! Please leave any questions or suggestions you have below.

And can I call this the JMAG?? :tsuki:

#2 BeachEMT

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Posted 28 June 2013 - 12:36 AM

This is a really awesome mod! I'm not a huge fan of the first method, but the second one is pure genius! Nice work!

Edit: If you could include dimensions on the hole placement, color/stripe size and the placement of the strip, that would be great.

Edited by BeachEMT, 28 June 2013 - 12:40 AM.


#3 Jeffsworkshop

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Posted 28 June 2013 - 02:47 AM

Hey Beach thanks for the compliment!

The hole placement is positioned between the first and the second ribs on the PMAG counting from the bottom up, it is aligned right at the centre (I simply eyed the spot) then drilled.
The bit size I used was 5mm, then slightly enlarged and crowned using a modelling hand hole drill. Remember to clean the debris  from inside the PMAG shell, or you will jam the springs.

The clear plastic strip I used has a width of around 10.8mm, just wide enough to fit within the BB channel without friction, and 24mm in height. The four corners of the plastic strip has rounded edges and bent slightly outward, so not to get caught on the springs. remember to coat the plastic with a primer to highlight the colours or text, or simply use a piece of white plastic sheet. Also try to find a sheet as thin as possible. I scavenged mine from a hard shell packaging. The thinner the better, without sacrificing rigidity. Somewhere around 0.25mm in thickness is perfect.

The cut on the plastic strip that catches the spring is as shown in the picture. I have found this cut to be the best and most minimalistic, and gets the job done. And for the placement on the spring, a simple trial and error is best, as I cut all my magazine springs, and my specific placement wouldn't do you any good...
But as a rough guide, start from attaching around 1" from the bottom, insert the mag and load it up. With a full mag the strip's top end should just about show in the indicator hole.

Hope this helps anyone that wants to attempt this mod!! :thumbsup:

#4 Huntsman82

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Posted 28 June 2013 - 06:08 AM

This mod is a game changer! Thanks for posting it Jeff. I can't tell you how many times I have used the tactical reload and then later had to use the partial mag only to realize it had 10 rds +/- left. I know what I'll be doing this weekend.

#5 gcw360

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Posted 28 June 2013 - 06:41 PM

I must say I am impressed.

#6 okay47

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Posted 05 July 2013 - 09:57 PM

A little late to this but yes, great mod.  Too bad I hate pmags  (I have 8 of them).

#7 Darcko

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Posted 20 July 2013 - 04:41 AM

I think I'm going to sacrify one of my Pmags to check this one out. Thanks for this post!

#8 Chuck S

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Posted 20 July 2013 - 05:57 AM

Hey Jeff --

When will you be marketing the plastic tabs and template for the witness hole?  I hate Pmags too -- but have at least 4 of 'em!

-- Chuck

#9 BioRage

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Posted 29 July 2013 - 11:58 AM

This is a brilliant idea, will be following this topic! :clap:

#10 BoobieM4H

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Posted 29 July 2013 - 12:13 PM

Legit

Sent from my SGH-T999L using Tapatalk 2



#11 JonathanNCP

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Posted 30 July 2013 - 12:15 PM

pretty cool!

#12 Jeffsworkshop

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Posted 07 August 2013 - 11:59 AM

Hey thanks guys for the positive feedback!!

Just got back to the KWA forums as it seem a little quiet around the time I posted this, so haven't came back to check it till now.

I'm not sure if this has been mentioned here before but there is an updated version of the PMAG rubber gasket that always seems to leak after a while. It has more "meat", or a little fatter, and seals for much longer then the previous version. Don't know if KWA USA has these updated gaskets, but I'm sure if you give them a call they will let you know.

Chuck, I literally found some scrap piece of plastic packaging laying around the table and got to work... the indicator hole location does not need to be exact, it just provides a window to see the plastic tab. I honestly don't think It would make much sense to ship a piece of plastic across the pacific where the postage will vastly out cost the product... :sigh:

#13 uscmCorps

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Posted 14 August 2014 - 02:24 PM

I need to check these forums more often. This modification is just awesome. Well done!

#14 archangel

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Posted 15 August 2014 - 10:47 AM

View PostJeffsworkshop, on 28 June 2013 - 02:47 AM, said:

, as I cut all my magazine springs, and my specific placement wouldn't do you any good...


Hi Jeff

I saw this section of your post, and have to ask, why?

Thanks in advance

Lee

#15 gcw360

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Posted 15 August 2014 - 02:44 PM

Yes, this was an awesome post!.  Thank you for bumping it.

#16 lockout

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Posted 18 August 2014 - 11:09 PM

Seriously Brilliant.




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