MasterPiece Arms Wedge Lock a.k.a “Cow Gate System”

MasterPiece Arms Wedge Lock system is a barricade stop device designed to be used with their bolt action rifle chassis.They’ve specially designed it to allow stabilizing the rifle on round barricades such as cattle gates, as well as on any other cylindrical surfaces.

MasterPiece Arms Wedge Lock -1

MasterPiece Arms Wedge Lock -2

The system consists of two barrier stops each modified to have a tapered side. The tapered surfaces contact the cylindrical barrier and pinch it applying enough tension to tightly clamp on it. In the video below Phil of MPA has also some grip tape on those tapered sides. However, it’s not clear if adding the tape is a must or just further enhancement of its gripping strength.

To adjust the Wedge Lock to any particular cylindrical barrier, you need to mount the wedges in proper holes under the forearm of MPA BA chassis. Once mounted on the barrier, this system allows both vertical and horizontal movement of the rifle.

Supposedly the main target market of this product is long range competition shooting, but it can be useful for other roles too.

The Wedge Lock is available through MPA’s website at $119.99.

Maybe to make this device a bit more versatile, it’d be good if they make it M-LOK or KeyMod compatible. Coupled with some sort of quick detach system it could be even better. In the current configuration, it becomes sort of proprietary to MPA stocks only.

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at


  • ozzallos .

    That’s so practical its kind of awesome.

  • Klaus Von Schmitto

    Whoever has this is going to have a huge advantage in the next gunfight at the OK Corral.

    • Phillip Cooper

      well, only if the whole “move” part of “shoot, move, communicate” is no longer important.

  • Badwolf

    Wow… For $120 they should have at least put a “tactical” on the name. Tactical gate bipod or something. Then it would totally worth it.

  • Rhesus Feces

    Crowd at the Bureau of land management are going to buy a load of these.

  • Porty1119

    If this is the answer, what in hell was the problem?

    • Joe Kriz

      Getting a stable position on a round barricade in competition.

      • JustAHologram

        Or not scratching up your rifle when taking a shot from a gate/tailgate around the farm/ranch

        • Bierstadt54

          And here I’ve been doing it wrong all these years, just using my hand or sling. Obviously I was not tacticool enough. 🙂

  • alex waits

    but it becomes useless if your target is greater than 10-15 degrees off 90 perpendicular to the cow fence?

    • Joe Kriz

      MPA has a separate rotating barricade stop that allows for lateral movement.

    • Martin M

      Good on you. I was actually thinking that this was a really brilliant accessory, and you found the obvious flaw. Rotation should be built in. Especially at that price. Then it would be a winner for any ranch rifle.

  • Kyle

    That has to be one of the most niche firearm products I have ever seen.

    • Joe Kriz

      Yes, it is. It was designed for use in the Precision Rifle Series and other long range rifle competition matches.

  • Jeff Smith

    This would actually work beautifully for the bed rails on the side of my truck.

    • JustAHologram

      I was thinking this just screams ranch rifle upgrade

  • Gary Kirk

    What did the cows do to you??

  • Ryfyle

    Why? I could build one those for a tenth of the price.

  • Ian McCollum

    The genius of that system is that some fool will probably pay them $120 for it. I love innovation!

    • Quest

      Yes! i mean using a frontrip with integrated bipod gives accuracy in normal situations and are usable with true cover.
      Who would shoot standing in the open behind a thin fence? And even if than like i said a frontgrip can be used similar.

      Btw should a military standart issue combat Rifle include a mountable light weight bipod? And i am right or did i screwed up the math quessing that a bipod mounted most forward is more accurate then one less forward? Because of the angle when you moving your shoulder might be smaller when its mounted forward.

      • Dan

        “Who would shoot standing in the open behind a thin fence?” Someone shooting at deer, coyotes other critters etc.

        With that said I don’t see this catching on with any purpose in mind.

    • Quest

      *Edit: oh its rather a competition thingy, then ofcourse cover isnt a concern

  • FulMetlJakit

    So can I buy 2 Magpul handstops AND a Dremel and still have money left over?

  • retfed

    Seems to me that it’s very height-dependent. If your round barricade is too low to shoot standing, and too high to shoot kneeling or sitting, what do you do? My knees hurt just thinking about it.

    • Dan

      Tactical step stool is the next product coming out to address part of that issue.

  • The Deplorable Boogur T. Wang

    Made for pig shooting , I guess.

  • Now all I have to do is find a cow gate.

  • B Hawk

    For $120 bucks, it’s good for NOTHING!