How to modify a real VLTOR MOD/EMOD Stock
Written by uscmCorps   

This all started by my love for VLTOR MOD and EMOD Stocks, but they were made to hold CR123 and AA batteries... not AEG batteries. I was getting pretty tired of using Crane Stocks with my G&P M4s, and in the Armalite Picture Thread I saw one of DaveDawg's M4s that used a VLTOR MOD Stock with AEG Batteries. Dave very kindly shared with us that he had create some custom batteries for him and he modified the MOD Stock to use those batteries.

Dave provided us with two essential diagrams:

This is the diagram that he sent to to have him make some custom batteries:

This is the diagram he used to illustrate the mod he did to the stock to make it work:

I ordered four sets of the batteries from, and had 3 stocks, a Basic VLTOR MOD Stock in black, another in FDE, and a EMOD Stock in FDE all needing to be converted.

Before I got around to doing the conversion, King Arms released a replica Clubfoot MOD Stock that held batteries. I bought one to see how they modified it, repeated the process on my stocks and generated the tutorial you see in this thread.

TUTORIAL: How to Modify a real VLTOR MOD or EMOD Stock to accept AEG batteries.

Once you've got your custom batteries from, you'll need to modify the VLTOR Stocks to accept it. I'll start with the MOD Stock conversion.

MOD Stock Conversion:

Step 1:

You'll need to cut a window in either side of the MOD Stock to allow one stick of the battery to pass through it. I cut a larger window than Dave did, mostly because I was replicating what KingArms did with theirs. I used a Sharpie to mark out the area to be cut, then used a Dremel rotary tool to remove the window. In the diagram below, you'll notice there are two separate sections I removed. One was for the battery, the second smaller window was because the KingArms stock uses a plug that appears to be the end of a buffer tube that conceals the exposed wires inside. I had planned to use the fake buffer tube plug on my real MOD Stock, so I kept that cut out (more about this later). However, if you have no intention of using any kind of buffer tube plug, you can cut the larger window further back.

Left Side -

Right Side -

The resulting cut outs should look like this:


Step 2:

The next step is to cut out the slot in the battery tubes to allow for the wiring.

You're going to want to cut this section out:


Here's how I measured where to make the cuts (the animation loops, please be patient):


The resulting cut outs should look like this:


Step 3:

It can be a little easier to install one of tubes on the battery first:


Remember to slide the battery in, wire end first.

Do not install it like this:


* Please note: the batteries are a very tight fit in the tubes. Putting the batteries into the tubes typically isn't a problem. When taking the batteries out of the tubes some care should be taken so as not to damage the wires by excessive pulling. My solution is to try and spread the sides of the window apart slightly so that the hold on the battery is a little less tight.

Step 4:

Then thread the other half of the battery through the center of the MOD Stock:


Step 5:

Install the other tube on the opposite half of the battery:


You can also add the caps to the tubes now.

Step 6:

As I mentioned eariler in the tutorial, I like to use the fake buffer tube end cap that I got from my King Arms stock. The plug looks like this:


Here's another pic.

When installed on the back of the Stock it looks like this:


doesn't look perfect, but it's better than nothing. It looks a lot better on the black stocks.

Step 7:

Close up both sides of the stock with the tubes. Take care to ensure that no wires are pinched/sandwiched by the tubes.

When closed up, the modifications, wires, and batteries should not be visible:


Step 8:

Add the bolt and nut that holds the entire thing together and you're set:



Once the conversion is done, all the parts in the MOD Stock kit should look like this:

( Click pic for larger version ).

Here's what the MOD Stock looks like when installed onto a Armalite style rifle:

( Click pic for larger version ).

*** Need to make an amendment to this tutorial.
I found that the windows in the side of the MOD Stock tended to sandwich the wires in such a way that the tubes didn't fully close in. So I extended the back/bottom of the window. The fake buffer tube end cap's clips still work and now the wires aren't sandwiched at all:



EMOD Stock Conversion:

The Enhanced MOD Stock (aka, the EMOD Stock) is very similar to the regular MOD Stock except it's a bit longer and has a rubber pad bolted onto the rear of it. This rubber pad is awesome because it allows for better shouldering of the weapon, but also, it covers up any wires visible from the rear thereby avoiding the need for any fake buffer tube end cap.

The airsoft aftermarket parts manufacturer, Element, just released what appears to be an exact copy of the EMOD Stock which still has the VLTOR trademarks. They're available in all three colors: Black, OD Green, and FDE (Tan). So now there is a cheaper alternative for those on a budget. I haven't seen the replica first hand, but if it is the same as the real one, this tutorial should work for it as well.

Step 1:

Mark out how big a window you will need to cut out on either die of the EMOD Stock.

Right Side -

Left Side -

When cut out, it should look like this:


Step 2:

Cutting out the windows in the battery tubes is essentially the same process as that which is done for the regular MOD Stock tubes... just a longer window. Look above in the previous tutorial, or refer to this pic.


The cut outs should look like this:


I cut the windows all the way to the end just in case I ever wanted to go with a custom 10.8V battery instead of my custom 9.6V batteries from

Step 3:

Insert the batteries through the window of the EMOD stock so that one half of the battery lies on either side of the stock, with the connector in the center of the stock.


Step 4:

Then install the battery tubes onto either half of the battery, and install the tube caps.


* Remember when installing the tubes, the wire end goes in first.

Step 5:

Close up the tubes.


Step 6:

Bolt up the Stock.



Once the conversion is done, all the parts in the EMOD Stock kit should look like this:


Here's what the EMOD Stock looks like when installed onto an Armalite style rifle:

( Click pic for larger version ).

And that's it. I hope these tutorials were useful to everyone. Please note that the proper precautions should be taken when using any kind of tools (I know I shouldn't have to say that, but I'd feel bad if someone injured themselves over trying this). Also remember that when using a Dremel or any rotary tool on plastic you have the tendency to generate unhealthy fumes from the plastic, flying fragments of plastic, and plastic dust. You need to protect your eyes, lungs and ears. I typically use some sort of face shield (a paintball face mask works well), a dust/particulate mask (so that I don't suck in any bad stuff) and hearing protection, all at the same time. A little overkill perhaps, but it lets me work unharmed for hours on end. :)

Good luck to you, and if you have any suggestions or comments, please let me know! ;)