Tubular AND Box Magazine Fed Russian Pump-Action Shotgun

Kalashnikov Concern has published some images and information about a very interesting pump action shotgun design. The shotgun is called MP-131K. It was designed in 1997 and sold in very limited quantities. What sets it apart from an ordinary pump-action shotgun is that it can feed both from traditional tube magazines and from detachable box magazines.

Images and description courtesy of Maxim Popenker and Kalashnikov Concern.

The tubular magazine can be loaded when the box magazine is detached. So the shooter needs to load the tube first, then attach the box magazine. In order to choose the feeding source, one needs to switch the selector lever on the right side of the box magazine body. The box magazine itself has a sort of a dual body construction. It is like a normal box magazine placed inside an outer shell. The actual inner magazine can move vertically inside that shell. So when the tube was selected as a feeding source, the selector lever lowered the inner box magazine, thus moving it away from the tubular magazine’s way. At that position, the tubular magazine was exposed and could feed the action. When the selector switch was turned up to its vertical position, it raised the inner box magazine, which blocked the tube and the action could be fed from the box magazine.

MP-131K was a 12 gauge shotgun. The tubular magazine had a 5-round capacity and the detachable magazine could hold 4 shells.

There were at least two reasons why it was sold for a very short time and then discontinued. First, strangely enough, it didn’t have high enough demand on the market. Second, it was pretty complicated to manufacture, especially the magazine.

To me, this system is incredibly interesting and could become something really useful and handy if it was further developed and refined. If they could make the magazine to be simpler and higher capacity that would be an outstanding defensive and combat shotgun. Imagine your main source of feeding (loaded with your primary ammunition – e.g. buckshot) are the detachable box magazines of 8 or 10 round capacity. That would give you an advantage of quick magazine changes compared to loading the tube magazine. At the same time, you could always have some secondary ammunition for different tasks (slugs, less lethal loads etc.) which you could switch to in a matter of turning the selector lever or by removing the magazine.

What do you think such a design could be useful for?





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 TFBHrachyaH@gmail.com


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  • Major Tom

    Mag fed and tube fed? Well now you’re just being silly. I’ll take two.

    I could also see use of such a system for simple increase in capacity. Load the tube with buck and load the mag with buck. 4+5 capacity and theoretically you have more compact shotgun as well.

    • noob

      and make it lever action and you’d have a mega winner in australia

  • PK

    “What do you think such a design could be useful for?”

    Increasing the total capacity without having a meter long tube magazine. Upscale it and have select-able baton/pellet 37mm riot guns, for different distance. Two different length shells, with normal/long range in the tube and the other in the box.

    None of this, past higher capacity and quicker reloading, really makes much sense. I can see why it didn’t sell too well, especially with a higher price!

    • Old Tofu

      a museum piece , that’s all this is useful for

      • Dougscamo

        Single shot shotgun or stylish door stop if you lose your magazine…..

        • Hrachya H

          If you lose the magazine you still have a normal tube fed pump gun

          • PK

            Or if your mags are all empty. That’s a big benefit of this system.

          • Dougscamo

            Okay….reread and saw that I missed the last line.
            I thought that the magazine had to be in place but with the lever in the magazine switched down….my bad! Mea Culpa….

          • iksnilol

            Dude, how you gonna load the tube mag if you have to have the mag in?

          • Dougscamo

            Hence my single shot comment….lose a mag out of rifle and that’s all yo got….
            Thought that the mag had to be removed to load and then provided the lift for the tube feed when inserted even if the mag was empty….give me a break so I ain’t a mechanic…Dang infernal Russian contraptions….ain’t used to such complicated shotguns….ain’t no wonder they ain’t made anymore! Just give me my tube pump or autoloader and I’ll be happy….or offer it in a belt fed configuration…whatever….Hell, I apologized….Get off my lawn….

  • Pete – TFB Writer

    Nice HH!

    • Hrachya H

      Thanks! 🙂

  • Dr. Longfellow Buchenrad

    That Browning-esque receiver design plus the wood furniture makes for a very pretty gun.

    Id buy one. I wonder what mags would cost though.

    • ostiariusalpha

      Maybe not quite Browning, I’d say the receiver is more Italian in contour, like a FABARM or Benelli Super Black Eagle.

      • Dr. Longfellow Buchenrad

        Im not all too familiar with shotguns, but I find the Browning silver series to be ridiculously pretty and this one shares the same lines.

        • ostiariusalpha

          That’s a good point, and the Silver is indeed a very pretty line of guns.

    • noob

      buy enough of these guns and magpul will make you a mag

  • The Mystic Seer

    Looks Russian, like a Klingon designed it.

  • Old Tofu

    they forgot the rule . . . keep it simple stupid

    • iksnilol

      It is simple though.

      • Old Tofu

        “Second, it was pretty complicated to manufacture, especially the magazine” . . . this means simple to you?? I hate when people don’t read

        • iksnilol

          I mean, sure, more complicated than an AKM mag but I’ve got faith in the Russians. I mean, they built folding 12.7mm rifles and a bunch of space magic.

  • Cyborg Fred
    • iksnilol

      Your photoshop skills are lacking, but you’re thinking basically what I was thinking.

      • Cyborg Fred

        Make a more majiku one then, in 5 min. With online photo editors.

        • iksnilol

          See, there’s your problem, online photo editors.

          Photoshop CS6, BABY!

          • Iggy

            Well? Come on, WE’RE WAITING!!!

          • Dougscamo

            Don’t bother him, he is busy refilling prescriptions…

          • Cyborg Fred

            Yes yes, one of these days I will be able to make real magic.

    • PK
      • Major Tom

        Needs a red dot and a shell carrier on the side too.

        • PK
          • Iggy

            Someone needs to show this to the Payday 2 guys…

          • noob

            can you optionally pull out the mag and use that magnetic two at a time shell loader to fill the tube and then put the mag back in again like this?

          • Flounder

            You are right, it needs shell carriers on both sides. And some rounds attached to the pump.

          • iksnilol

            OH COME ON!

          • Major Tom

            Now it just needs a really bright tac-light and it’s perfect.

      • Hrachya H

        Add a Magpul forearm and you have a pure tacticoolness …LOL

        • PK
          • Hrachya H

            Hahaha :))) Awesome!

          • noob

            Welcome to Jurassic Park! Spared no expense!

          • iksnilol

            Please stahp, at least use the “match color” tool… please, y’all are making a graphic artist cry here.

          • Dougscamo

            And all this time I thought you were just a field hand/pharmacist….

          • iksnilol

            Hey, gotta pad that resume.

            Never did get paid for my graphic work (just made a couple of logos for local firms).

  • ostiariusalpha

    You see Pardus? That’s how you do it.

  • Bierstadt54

    I’ve thought of this before, because you could have the mags for the bulk of your ammo usage with the tube backing it up as needed. It’s neat to see that it has been done before. I think a semi-auto system that draws from the mag first and tube when the mag is dry would sell better than any of the mag-only shotguns that have been made.

  • Giolli Joker

    “What do you think such a design could be useful for?”
    Practical shooting competitions instead of cumbersome extended tubular magazines, maybe.

  • iowaclass

    Mossberg venom does not have switching between tube and drum.

    • iksnilol

      Because it only feeds from the drum.

  • NOUNBELIEVER

    for what is it useful…to whom would it appeal….me

  • Swarf

    Hell yes.

  • iksnilol

    I find the system interesting since you could have a higher capacity in a smaller shotgun (short barrel shotgun). Imagine a shotgun with a 3 shot mag tube (basically just enough mag tube to have nothing extend past the pump grip) and with this 4 shot mag (which doesn’t look large) and you have 3+4+1 for a whooping 8 rounds in something that’s almost as small as a masterkey or Serbu Super Shorty.

    • Hrachya H

      Good point!

      • iksnilol

        You can have a really small shotgun, without having the limited capacities of shotguns like that.

        I like it. Wonder how expensive/practical spare mags for it are though.

    • I’d almost rather have the single magazine feed, and use 7 round mags for 8 rounds with a lot less complexity. Sure, the box sticks out 3″ lower that way – but you don’t have the weight in the tube at all. And reloads are even faster.

      This dual feed idea makes sense for a user who expects to need two different flavors of rounds and be able to switch between them in a moment’s notice. IOW, the same reason that dual feed HMGs and autocannon exist. Like for a SWAT cop — breaching loads or less-lethals in the tube, buck in the mag, and if you think you need a third choice, slugs in a spare mag carried in a dedicated pouch distinct from any spare mags full of buck.

    • wetcorps

      Or go the other way and combine a 3-gun extended tube with a saiga 12 drum for the clunkiest, heaviest, most cumbersome 30 rounds shotgun 🙂

  • Poresz Poreszovics Poreszov

    I have searched the answer for years, how the MP-131K works. Thank you for your translation and summary. 🙂
    Unfortunately it is much more difficult, than I expected.
    I still have questions: what happens with the elevator, when the gun feeds from the box magazine? Is there a patent (in English)?

    • Hrachya H

      My pleasure! No idea about the patent and about the carrier question.

  • Sam Damiano

    For the dual ammo idea you’d have to know what round you wanted before you loaded it and after the next shot. Kind of like my friend who alternated buck and slug in his 870. Sounds good but one of the two isn’t what you want when you pump it.
    I do like the look of it over the Saiga AK 12 gauge. It would also give you a quick reload for waterfowl three rounds at a time. Maybe that was the missed market, a box fed semi auto 12 gauge.

    • noob

      I guess you could pop up the magazine switch and cycle the round you don’t want onto the ground.

  • PK

    Oddly, apparently the MP-131K is actually in use in Bangladesh!

    • Hrachya H

      Interesting! Any images or videos?

      • PK

        Not so far, and I’m not paying the $4 for the whole article… let me try looking in different languages, I bet I can find something.

        • Hrachya H

          Cool, thanks! What language is that article in ?

          • PK

            English, but I found a picture. Looks like they have 5 round or greater capacity mags… and side-folding AK stocks!

            https://uploads.disquscdn.com/images/c2e14176daad054db3eea509fa5c5c145466fbe13f23bb6bbe0f55754402d2c8.jpg

          • Hrachya H

            Hmmm … are you sure it is the same shotgun? The magazine looks to be larger.

          • PK

            It seems to be the same shotgun, yes. The mag is longer, to hold more rounds, but it has the MP-131K optional side folding stock. There’s not a huge amount of literature out there, but there’s a bit… apparently a lot of the MP-131K ideas went into the MP-133K, according to Popenker’s site.

            Who knows, maybe they’re MP-133K, but that BDMilitary website lists them as MP-131K.

          • CSBD

            Those are actually Baikal 81s in that picture above.
            5rd box magazines. Tube is non functional (there is no lifter). The lifter function is served by a large follower that sticks more than a shells diameter out of the magazine when empty.

            There are small a number of them in the USA (sold by SOG in 97 or 98).

          • PK

            Oh, that’s a shame. It’s the only image I found, among many other police units in Bangladesh … and the article led me to believe they were MP-131K shotguns. Oh, well!

            Thanks for the correction!

          • CSBD

            They are roughly similar. I only know the 81 because I have one.

  • RazorHawk

    Make it a gas fed semi auto and it will sell like hotcakes.