Home AR-15 How Does it Work: Stoner's AR System

How Does it Work: Stoner's AR System

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31 COMMENTS

  4. I always believe that a true DI system should have no sealing component at the end of the gas tube. Modern day so-called DI is either AR15's unique internal piston or a hybrid system like the Chinese HMGs or the Perun X16

  5. This is why Forgotten Weapons is so great. Telling the back stroy on the weapon and showing the internal mechanisms. Its one thing to tell me a gun is cool or complex but showing is so much better. Showing how it works and why will always be the best. No one does it better than Ian

  10. I disagree.

    In mechanical applications, a piston can be described as the part that is acted upon and which does the power stroke.
    Like in an internal combustion engine, where the combustion acts upon the pistion and drives it down to move the crankshaft.
    If we compare that to firearms, let's say an AK47- we see the same. A piston being acted upon by the gasses and being pushed back. Instead of conrods and a crankshaft, it is of course connected to the bolt carrier.

    In the AR10/15 design, there technically is no piston. The bolt is not acted upon and pushed back- it is merely a sealing surface for the gasses. If anything, it would be the carrier that could be the piston, as that is the part being acted upon and then drawing the bolt along with it.
    However, since the gasses directly act upon the bolt carrier (one may call it a direct impingeing force on the bolt carrier) it should be considered a "direct gas impingement" system, in my opinion.

    Just because the gasses are directed inside the carier and "hit" the bolt and carrier, I don't think it should be called "piston operated".

  12. i dont think hybrd or Piston is accurate either. the,,"piston system is more for timing than the operation of the rifle. the BCG is still beimg moved directly by gas.

  13. The presence of gas rings on the bolt really seems to trip people up. This "piston" is no different than the enlarged end of the gas tubes on the Ljungman or MAS 44. It doesn't do anything itself to drive the carrier, but acts as a more efficient seal while the gas pushes against the carrier. It's only a quarter-step away from those basic direct impingement systems, as far as I'm concerned.

  14. IT ISA DIRECT IMPINGEMENT firearm, you just said it yourself, The gas enters the bolt carrier and pushes it back, to function the weapon. That's it, nothing more. You can say what the bolt does, but that's because the carrier is moving rearward BECAUSE OF THE DIRECT IMPINGEMENT.

  20. Could you really count that « piston » as contributing to the action?
    I’m pretty sure the gun would still cycle if you plugged the hole leading to the bolt and just kept the cup.
    It seems like it’s just there to reduce the friction the bolt and locking lugs.

  21. How would you feel if i was to call a real direct impringement system a "zero length long stroke has piston system"? As far as i can tell, they are essentially the same thing, with the only difference being where the gas tube ends and the bolt carrier begins.

  24. These explanations of how guns really work is something no one does as well as "forgotten weapons "
    It's really not a gun channel but a engineering and history channel

  27. Ian's description makes the bolt sound more like a cam lug than a piston. Overall the operating system seems like a modified DI operation. In the grand scheme of things this is a pointless debate.

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