Russian OTS-14 Groza “Thunderstorm”


When it comes to AK style weapons, I am a greenhorn. My friend Jim on the other hand loves them and can talk about the minutiae variants that exist. However he mentioned this and it piqued my interest. The OTS-14 Groza aka Thunderstorm. It is a bullpup version of the AK.

Here is a Russian video about the Groza.



Here is a video of someone taking the OTS-14 apart. I am not sure how that forward trigger transfer bar works once it goes back into the AK.

Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at


  • William Johnson

    Reminds me of the original Bushmaster bullpup 5.56 developed as a PDW.

  • John

    Don’t forget the Norinco 86S bullpen AK.

    • SirOliverHumperdink

      I’m the proud owner of one

  • TheNotoriousIUD

    Looks like quite a kick from the grenade launcher. I like the M16 carry handle.

  • JumpIf NotZero

    Interestingly, that with the parts commonality, that no one in the US has made a clone. Remarkable actually.

    As to the trigger, it looks like the bar must push on a trigger “stub” in the original position. So imagine an entirely stock AK trigger with its single-axle-double-sear and the trigger stub right I front of and under that, this bar pushes on what would be th trigger minus the protruding finger part. I wouldn’t be surprised if it was a stock AK sear, disconnector, hammer and spring.

    • Dracon1201

      A few people (Including myself) Have built them. They aren’t super hard.

      • JumpIf NotZero

        I don’t follow AK at all, and homebuilt even less so, but you should send a pic in for potd. I’ve never seen a clone.

      • BrandonAKsALot

        You the one on WG that just did one not long ago?

        • Dracon1201

          No, I haven’t posted it before now. I’m rebuilding the trigger for a stronger, smoother pivot system. It will be an improvement to the original.

          • BrandonAKsALot

            You on any of the builders forums? I’d love to see your work in detail.

          • Dracon1201

            Akfiles. I’m there under the same username as here. I’ve never posted my work up as I’m not particularly showy. It’s an invaluable resource, though. I haven’t actually built anything from scratch. At this point, my experience has been limited to building accessories and kits for current production AKs while I slowly acquire tooling to do actual builds from scratch.

  • Nicks87

    Oh… that thing is sexy, in a minimalist sorta way.

  • Dracon1201

    I love these. Can’t stop making them.

    • Nicholas C

      Please Email me. I am very curious about your build.

  • Nick

    CBRPS has been making some conversions similar to this, however they’res are made to stay out of NFA. Not bad looking. This one seems a lot cleaner, and looks nice, but it’s still an AK, so no thanks.

  • Hensley Beuron Garlington

    That’s a perfect little truck gun. I wanted to do this to my Zastava PAP M92 pistol when I got it! Now I’m inspired to try it again. I love the simplicity of this setup.
    Honestly, the only two things I want added to an AK is a left hand charging handle and last round hold open, even after dropping the mag, so when I do those cool, quick reloads, I simply drop my safety and the bolt slams home. These things should be under $750.

    • Can you bullpup a pistol and still have it recognized as a pistol?

      What are the length of barrel / full length restrictions on pistols?

      • politicsbyothermeans

        Yep, the Draco bullpup got a thumbs up from the ATF. I saw a guy with a new Uberti Buntline a few weeks ago with an 18″ barrel. I am no NFA expert but I don’t think there is a maximum length for pistol barrels.

      • Hensley Beuron Garlington

        As politicsbyothermeans shows, it can, but like a Sig Brace, you can’t “legally” shoulder it or some be.

        I don’t know about length, but I am guessing I’m guessing if it is under 16″ barrel length, no stock and no vertical foregrip, it is a pistol. Have to Google that.

  • Dougboffl

    I can’t get the audio issue corrected – I can’t understand a word they say.

    • Michael Lubrecht

      Amongst all the Russian, I did hear the word “bullpup” said a few times. Cool!

      • JumpIf NotZero

        Modern, Concept, Bullpup, all apparently cognates.

  • Menger40

    I searched google for a source on that top image, and was surprised to find that it’s an airsoft gun. It’s a Hephaestus OTS-14 GBB that was worked over by a Taiwanese custom shop called Papago Arms. Looks pretty darn good.

    • Green Hell

      I figured as much. As far as I know, there’s no production 5.45 version of Groza.

      • Thomas Higgins

        There were some prototypes made of the 5.45mm version, but you’re right, it never made it into service – the advantages of the 7.62x39mm and 9x39mm versions were greater.

  • Vhyrus

    There’s no place to put your support hand though. You have to hold it like a handgun.

    • wetcorps

      Some versions have either a forward grip. Some have a grenade launcher or a big suppressor that helps balancing the whole thing and provide a place for your off hand.

    • politicsbyothermeans

      wetcorps is right. The basic issue Groza has a variety of attachments for the barrel. If I remember correctly, you have to have one of them installed to retain the forward trigger pack. Even if you don’t have the front grip, a can or the grenade launcher, you’re taught to grip it exactly like a pistol so you’re right too, Vhyrus.

    • John Yossarian

      Not having any experience with this rifle, but from looking at it, I would try holding the buttpad & receiver into my shoulder with the off-hand. This might be more stable than having both hands way the heck out there on the pistol grip.

    • Zugunder

      What do you think this m-16 style handle for?

      • DW

        Iron sight, and it facilitate the mounting of optical target acquisition devices.

  • wetcorps

    The most interesting part about the Groza is the ammo it uses : 9x39mm with very heavy bullets. It was made to be subsonic and yet still pierce armor from a few hundred meters.


    • Kyle

      Neat, I bet those would lay out some hogs with a proper hunting bullet.

      • Jon

        The 9x39mm was designed to use as a sniper bullet, that would work properly with hogs. You could even hunt a body armoured hog with the SP-6.

        • Gun Info International

          nope. you don’t

          • Jon

            I’m not speaking about the legal side, I say you could penetrate a boar sideplate even it was wearing an armoured vest.

          • Gun Info International

            I’m not either.

            9×39 has awful penetration. It would be stopped by NIJIII no problem

          • Fegelein

            When NATO saw 9×39, they sharted themselves.

          • Jon

            Do you know different 9×39 exist and some of them are and some are not armour piercing? What 9×39 are you talking about? Any reference?

    • Xtorin O’hern

      cheeki breeki!

    • Gizmo

      Stay out of the Zone S.T.A.L.K.E.R

      • randomswede

        No way, the zone belongs to everyone; Freedom must reign!

    • BrandonAKsALot

      My mags need some of that. Wish I could find some of the legit stuff.

      • iksnilol

        Has been made in the US.

        Called it .358 gremlin IIRC.

        • BrandonAKsALot

          But that’s no fun. I need that Soviet black magic.

          Although I’ll likely be doing some build with the gremlin. The mags have inspired me to want to do something in it. Just have to figure out what.

          • iksnilol

            I am just thinking it isn’t *that* complicated.

            I mean, 7.62×39 case + 9.3mm bullet.

          • BrandonAKsALot

            If I had a lathe, it wouldn’t be bad. I could just make my own sizing dies and resize the brass for it. That’s the one major piece of equipment I have yet to purchase though. I’m working on updating my shop and I may be able to fit one in once I have everything organized.

    • Gun Info International

      well, it actually doesn’t

      sp5 gives quite ugly results even on 80 meters.

      150- you get no penetration at all. and may i remind you the ugly ballistics and the short barrell.

      • Jon

        For your information SP5 is not an armour piercing round.
        About its performance, were is your affirmation based in?

  • Oh lord, it is so tiny and awkward! I love it!

  • MisterMoad

    So your friend “Jim” is Battlefield 4? Right?

  • randomswede

    I’d never seen the 7.62 version before I read your post, from it’s designation I’m guessing it’s the original configuration with the 9×39 being the later and favored configuration.

  • Thomas Higgins

    I’m not going to say I’m jealous of that guy with the suitcase full of Groza goodness, but I’m jealous of that guy with the suitcase full of Groza goodness.

  • Bob

    *Insert S.T.A.L.K.E.R reference*

    Literally the first and only place I’ve seen these things…

  • Division Charlemange

    See a lot of ‘ArmPistol’ in the way it looks.. but then you would in pretty much any small bullpup..

  • Jon

    You have not understood anything, he is firing a assault rifle not a sniper rifle and he is firing it witout optics. Even in this conditions he says its a quiet, accurate but slow weapon. He says you can clearly notice how slow it is at 150 meters… That’s what you can expect from any subsonic bullet, it will take half a second to fly that distance…
    About hardened steel penetration… He is comparing a non armour piercing 9×39 vs an armour piercing 5×45, guess who won?

  • Mazryonh

    Was this ever made available in a 5.45mm version? If it was it could replace compact AK rifles, like the AKS-74U.

    Can the buttstock be extended out too? Not everyone uses the same length of pull.