MBX Extreme – Magpul CTR Stock Extension “Fang”

When I first had a quick look at the MBX “Fang” I thought it was a monopod, like the Accu-Shot, and thought why didn’t they make it adjustable? How do I go prone with this on my rifle?

I continued reading and while I still have a lot of doubts as if my shooting could benefit from this upgrade (i.e. shoot faster, better and climb the podium) I have to admit that this is not only a solution looking for a problem. It may actually help, at least in some occasions.

MBX Extreme do a lot of shooting accessories and TFB has covered their offset C More mount before, which is another “strange” product.

The MBX “Fang” is designed for the Magpul CTR stock and it’s primarily designed for people who race their Pistol Carbines. It will give you a deeper contact point shoulder vs. rifle and it will bring your head up.

Below: Red, Black or Blue.

In terms of recoil control, well a pistol carbine doesn’t have much recoil. I’m rather thinking it could help me keeping the stock to my shoulder as I reload or run from a target to another.

This could work for Mini Rifle (.22LR) in IPSC too. There’s no recoil and there’s a lot of very fast shooting in Mini Rifle. However, it might be that it’s not allowed to remove the “fang” during the competition. Once it’s on it has to stay on, and then you can’t go prone any longer.

Above: Yes, that looks like a weapon on a weapon.

The New MBX “Fang” extends the factory Butt Stock to allow for deeper and more stable contact with the shoulder pocket. Other benefits includes greater recoil control and added stability when reloading along with a raise stance when used in conjunction with MBX offset C-More mounts.


You can see how it works in the video below:

The “Fang” is just 39,90 USD and you can find it here.

What do you say about the MBX “Fang”?

I’m still wondering, how do I go prone with it? Is this a product you would consider?

Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with an European focus. Always ready to increase my collection of modern semi-automatic firearms, optics and sound suppressors. Owning the night would be nice too.


  • Now I have an idea for an actual adjustable monopod for Magpul stocks which is in no way basically this but with a channel down the middle so the screws can be loosened and the extension slid up and down.

    • Preacher

      Do it and I would buy it … since loooooooooooooooooooooooooooooooong I am awaiting “SSR” adjustable stocks on combat rifles. Weapon has to fit you – not you the weapon!

      • Dracon1201

        Luth-AR stocks might fit your bill

  • Sasquatch

    Run out of ammo start hittin’em in the head.

  • Joe

    There was a stock that emulated this over a decade ago, and was dismissed due to aesthetics, regardless of actual function. The inline nature of the AR is great with iron sights, but when using optics you either raise your head to meet them, or scrunch down to meet them. The former (and more natural) method leaves the toe of the stock in the shoulder pocket at best, and the straight-line recoil is now above the pocket reducing control and slowing follow-up shots. That said, military body armor eliminates the shoulder pocket, and I see lots of photos of the toe of the stock perched on top of the armored shoulder. This may be only for scanning, but I don’t know that there’s a transition to the shoulder when actually firing the weapon. This product seems a bit on the long side, but I don’t doubt increased functionality in some circumstances.

  • AMX

    I guess you could use it prone with a really tall bipod?
    That could get quite hard on your neck, though… maybe use a periscopic optic…

  • There it is… the next dumbest gun accessory next to Magazine Floor Plate Bayonets and LED lit Shotgun Magazine Tube Followers.

    • That is what I thought, until I tried it on someone else’s rifle. It does make the rifle feel more secure in your pocket which allows you to be more aggressive with the gun.

      Do I think it has much utility outside of competition? Probably not. Is it something I went out and bought that instant? No, in fact I still haven’t purchase one yet. But it is on my to buy list one of these days.

  • Destro Yakisoba
  • Sam

    So many dumb products.

    • USMC03Vet

      Welcome to shooting competitions.

  • Ryfyle

    I really don’t see the appeal. Couldn’t some one make this out of wood?

  • USMC03Vet

    Nice utility belt, Batman.

  • Qoquaq En Transic

    One word: WHY?

  • Steve W

    Oh, I don’t know.. might be great for stippling practice.

  • gunsandrockets

    Interfere with AR prone shooting? IDK.

    Eyeballing the dimensions, it looks to me like that gizmo wouldn’t interfere with prone shooting any more than a 30 round magazine already does.

  • Sledgecrowbar

    Two things: the bottom should be as wide as the rest of the stock, and it should have a locking hinge in the middle for transport. The second thing is expensive and not totally necessary since the grip basically is that low anyway, but having it be so narrow kind of defeats the purpose for me.

    It’s not the worst idea ever. The AR does force you to tuck your head into it to get a proper cheek weld in the standing position, unless you like having the bottom of the stock dig into your collarbone.

    It would actually be cake to make one of these out of wood or even 3D print it. You’d be out a dollar and half an hour of effort or less.

  • b. griffin

    The thing on the stock that goes down.