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Thread: 7.62x25 Bullpup

  1. #1
    Gunco Member xebec's Avatar
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    Default 7.62x25 Bullpup

    Hello all,

    Its been awhile since I've posted here, but I just completed a project that I have been working on for several years, and thought I would share it here...

    My idea was to build a 7.62x25 AK conversion using parts that I had available from many years of home gunsmithing, as well as readily available stock and materials from my shop. I decided that a bullpup would make some sense from the standpoint of compactness- I didn't really want a full sized AK in a pistol caliber. I wanted it to work with unmodified PPS 43 magazines, fullfill the minimum barrel and OAL legality requirements, and have the ability to utilize as many aftermarked parts and accessories (sights, optics, lights, grips, whatever) as possible.

    I spent some time working out the details and geometry of the front end, as I saw this as the weak point on many bullpup conversions, particularly the problem of how to incorporate good sights to the basic AK platform. My solution was to build a stable platform for the incorporation of a picatinny rail on which could be mounted good aftermarket AR type removeable sights. I wanted to keep the sight radius as long as possible, and this determined the length of the basic front end components. It also left room for supplementary rails that can be used for other application (foregrip, lights, sling mounting points, etc.)

    Another problem area for the bullpup was, of course fire control. I used a lightly modified AK fire control group in the (5.56 Saiga) receiver, actuated by a completely contined front trigger pack with a primary safety, and linked by a pull/pull cable under constant tension provided by the AK hammer spring. This turned out quite well with a trigger weight of about 7 pounds, a fairly short pull and crisp break, and a positive reset. AK fire control components are very good for this since the sear sufaces are large and provide a lot of room for adjustment. The trigger is adjustable and sets the length of engagement between the rear trigger carriage hook and the hammer. The primary safety block movement of the trigger, and is actuated by a lever near the right front of the trigger guard. The AK "clacker" safety is still fully functional as well.

    The weapon is gas operated, and uses unmodifed AK hammer and recoil springs. The bolt carrier is slightly lightened, but would probabally work fine with no modifications other than the necessary adaptation to a very short (~1") piston. It runs very well- I have about 500 rounds through it at this stage. Reliability is excellent, ejection is very positive, and it actually runs quite clean with the several available varieties of surplus ammunition. Anyway, thanks for looking, and I hope some might find this useful...

    xebec
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    Last edited by xebec; 11-15-2009 at 12:46 PM. Reason: Problems with displaying image

  2. #2
    No Hope For Me Coils's Avatar
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    Very nice design, thanks for the info and pic.

    I know someone or others will ask, but if you get a chance post more details and pics.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  3. #3
    Gunco Member xebec's Avatar
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    Coils,

    I would be happy to post more info. I will take some pics this week of the various detais, but I won't be able to post anything until next weekend.

    xebec

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    Indian Admin Winn R's Avatar
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    Welcome back!

    Your split aluminum plate is still doing duty. Thank you.

    Did you use a '74 bolt and trunnion? For the gas operation, did you reduce the bolt or trunnion lock up?
    There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action. -- Bertrand Russell


    "Never attribute to malice that which can be adequately explained by stupidity." Robert J. Hanlon

  5. #5
    GuncoHolic Rahatlakhoom's Avatar
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    That's real sweet.
    Glad to see such an inventive concept.
    Good to see ya again
    Charter member-Busted Box Club est. 2006

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    Gunco Veteran [486]'s Avatar
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    Nice job. I'm eagerly awaiting the detail pictures.

  7. #7
    No Hope For Me 1biggun's Avatar
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    cool. would like to see pics of the feed ramp. and extractor distance from the barrel ect.
    would like to see the cabel system as well for the trigger.

    Im not a big bullpup fan but they are growing on me. I have been thinking a 22LR bull pup might be cool and easy to handel

  8. #8
    Gunco Regular Shadow Walker's Avatar
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    It looks very good!

    I have decided that a Laser is the best aiming device for the Bullpup. I will use a laser on my next Bullpup, particularly if it is a pistol caliber instead of a long range caliber.

  9. #9
    tired of idiots vz58's Avatar
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    very nice, post more..

  10. #10
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    Quote Originally Posted by 1biggun View Post
    would like to see the cable system as well for the trigger.
    This is the main one I've been wanting to see other designs on. Been wanting to make a groza rifle ever since I picked one up in a videogame.

    Got a milled x39 rifle that could be made to a bullpup design by the time it is done, and I would like to see which design looks like the best. So far it looks like I'm gonna be going with a "pushrod" type design with a 1/8"x1/2" flat pushrod to actuate the sear.

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