HK Paddle mag release, NFA legal conversion
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Thread: HK Paddle mag release, NFA legal conversion

  1. #1
    Gunco Rookie nitro450exp's Avatar
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    Post HK Paddle mag release, NFA legal conversion

    Hello All,

    Made my 1/8" pin and bushing today.
    Also bought a non cut grip frame to do a clip and pin conversion.
    Here comes the questions.
    What is the dimension from the mag push button down to the pin ?
    Are they on the same axis ?
    I know that every one says just use the grip frame as a template.
    But H&K must have a blue print and it should state the dimensions.
    I have acess to a bridgeport, it will be real easy to use a hole center,
    on the mag hole and just move the required distance on the table,
    then pop in an 1/8" mill and pop in a hole.
    Thanks
    In advance.

    PS: Any reason HK parts (contact piece and paddle) won't fit a clone ?

  2. #2
    Gunco Good ole boy kernelkrink's Avatar
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    I'm sure HK has a blueprint. They sell them, along with the tech package, to their manufacturing license purchasers. Anybody else, lotsa luck! Same with the FAL, everybody who purchased one of those raw castings from Tapco would kill for a factory blueprint. FN and DSA ain't sharing.

    If you want a dimension I suggest using your gripframe as a template, mark the opening, then measure off the dimensions yourself.

    The factory paddle parts can be made to fit any clone, the problem is some use a solid mounting shelf where the paddle goes. If the shelf is a "U" shaped piece that fits over the sheetmetal and is welded on, all you need to do is drill the blind hole and make the slot for the paddle. Some fitting may be required, but that is pretty minor. If the shelf is a solid bar of steel that was welded into a cutout in the sheetmetal, you have some work ahead of you. The inside of the solid steel shelf has to be hollowed out to accept the parts. Easiest way is to cut it off, mill it out, then weld back on.

  3. #3
    Gunco Regular allesennogwat's Avatar
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    Some details at this link.

    Building an HK G3 Clone on a JLD PTR-91 Receiver

    It says to have the trigger housing inside the grip housing for proper location. Click on the pics for larger views.

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    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by nitro450exp View Post
    I know that every one says just use the grip frame as a template.
    But H&K must have a blue print and it should state the dimensions.
    I have acess to a bridgeport, it will be real easy to use a hole center,
    on the mag hole and just move the required distance on the table,
    then pop in an 1/8" mill and pop in a hole.
    Thanks
    In advance.
    I have never seen any official measurement in the times I've seen this discussed. If they are like AK receivers, then I have read that the magazine release is located and installed AFTER the receiver is assembled to ensure a good fit in spite of factory production-line tolerances (or lack thereof!)

    Installing a magazine and measuring the distance from the magazine body would be the easiest way to get an absolute value. Transfer that measurement onto the receiver and presto you're done.
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  5. #5
    Gunco Good ole boy kernelkrink's Avatar
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    An HK uses a pushbutton mag release similar to the AR15, the paddle simply sits below it and converts the rocking motion to a sideways motion that releases the mag. The hole for the mag release is already present in a receiver. The problem is the paddle release uses the pistol grip housing forward mounting hole as an axle. When the HKs were converted to semi only the forward mounting hole was eliminated and a small shelf welded over the area where the hole would have been. This prevents a FA pack from being installed and the semi pack just sits on top of the shelf for a mounting point. Drilling that hole converts the receiver into a FA configuration, much like drilling the "third hole" on an AK does. To install a paddle legally an undersize hole must be drilled to install a blind pin that is welded over after installation. A sleeve is made for the paddle so it fits properly over the undersized pin.

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    Gunco Rookie nitro450exp's Avatar
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    Thanks Guys,

    I am fully aware of the correct procedure.
    My clone will require me to mill out the solid shelf and then drill the blind hole.
    I was just hoping to get a dimension so that all major work,
    could be done utilizing the digital readout on the Bridgeport, I have access to.
    No such luck !
    By the way anyone know where I can get the spring that puts tension on the paddle lever ?

    Thanks
    Again.

  7. #7
    Gunco Good ole boy kernelkrink's Avatar
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    The spring is riveted to the paddle (anti-rattle spring) if it came with one. Not available separately AFAIK, but you can buy the whole updated padle. The vast majority had no spring. If you hand fit the paddle slot you can eliminate any slack.

  8. #8
    Gunco Regular allesennogwat's Avatar
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    There are a couple of different designs over the years but I think the only spring is the mag catch spring, not on the paddle itself. You should remove the mag catch spring before welding.

  9. #9
    Happy Camper hcpookie's Avatar
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    Found another older reference site for the conversion I had forgotten I had saved:

    paddlemag
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
    http://pookieweb.net/AK/rivet/boltcutters/boltcutter.htm


    Project Pink - the Pink and Blue AK-74:
    http://pookieweb.net/pink/pink.htm

  10. #10
    Gunco Rookie nitro450exp's Avatar
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    Thanks.

    When researching I saw one picture where an anti-rattle spring had been made,
    that put tension on the paddle and pushed off the mag well, did not know if it was factory, before the started putting them directly on the paddle

    Nitro450exp

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