Similar to X-Ray Guns, someone took their lower receiver and X-Rayed it. However this is a polymer lower. It almost looks invisible in the X-Ray image. I am surprised at the position of the buffer retainer. Look at how far forward it is canted. Perhaps that is just a characteristic of the polymer lower or do all buffer retainers lean that far forward?

Does anyone recognize the stock? It appears to have an adjustable cheek riser. I am interested to know why there is a horizontal coil spring in the stock.



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  • TheNotoriousIUD

    “I think I found your problem. Theres no upper on this thing.”

  • AmmoMFG (Drew)

    The buffer retainer does lean that far forward, IIRC it’s 10-15deg off vertical. You will notice this if you look at the cut-away drawings of AR/M4 lowers. It’s interesting that some of the plastic in the stock has a greater X-ray cross-section than that of the lower.

    • flyingburgers

      Those pieces are probably made from a glass-filled polymer, which is very common in firearms parts (holsters, Magpul stuff, pistol frames).

  • wahooyahoo

    It is leaned 6 degrees forward. The only reason this is done is to make the part machinable. It can’t be vertical otherwise the machining would interfere with the buffer tube threaded area of the receiver. If the whole feature was pushed forward, then the buffer tube would be more difficult to manufacturer.

    • Otm Shooter

      This^. Pretty straight forward reason, from a manufacturing sense.

    • Nicholas C

      Did not know that. Makes sense.

    • ZeFrog

      I may be wrong, but canting the buffer retainer forwards also reduces the probability of having the buffer’s head acting like a cam on said buffer retainer.
      This phenomenon could very likely happen with worn out perpendicular parts.

      • wahooyahoo

        When the upper and lower are fully assembled(correctly) the buffer never actually touches the buffer retainer. It is there only to keep the buffer in place when the rifle is broken down into the upper and lower assemblies.

  • Roy

    You fired X-rays at live ammo!!?!?!!?!!?! /s

    • TheNotoriousIUD

      I think they turned into spiders.

      • Jwedel1231

        THAT’S EVEN WORSE!

  • Sianmink

    Stock is a Mako group GL Shock. The horizontal spring is a little recoil buffer.

    • me

      Yes it is the Fab Defense/ Mako GL Shock. Great stock for fifty bucks. I put it on one of my M70s and there is a noticeable reduction in recoil, also the adjustable cheek riser is perfect for when I use a scope.

  • Otm Shooter

    Needs more auto sear

  • ZeFrog

    I guess that the second coil spring is a part of a length adjustment system: When one presses the handle located under the stock, the perpendicular bolt disengages one of the recesses located under the buffer’s tube. The second coil then pushes the butt plate in order to automatically extend the stock.