Quoted: I was only curious about the physics/mechanics of the process. What exactly causes a semi-auto sear to trip repeatedly....not if you believed it was responsible or not
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OK, it's not accurate and it's a waste of ammo. Now that that's out of the way...
...it's also alot of damn fun. I've done it many times with my AR, and have done it safely. It's not like an AR has a bunch of recoil, so your not going to be spraying bullets all over the place. It's not hard to keep them within 10 feet or so. There's no practical use purpose to it, other than pure unadulterated fun - which is as valid a reason as any.
Here's how it works: You place a relatively stationary object (like your thumb hooked to a beltloop) in front of the trigger through the trigger guard. If you pull the rifle forward slightly, you will cause the hammer to fall, thus firing a round. The recoil of the rifle will bring the rifle back some, and the trigger will reset. Since you are maintaining slight forward pressure on the rifle with your non-firing hand, the trigger will be pulled again immediately. Repeat until out of ammo. It's the recoil that makes this work. It's kind of tricky on my 20" HBAR, and much easier on a lighter M4gery of sorts. Rifles like Garands, AK's, SKS's, etc are much easier at first, becuase the recoil is much greater. The trick on some AR's is not using too much forward pressure with your non-firing hand. If you do, the recoil will not be sufficient to reset the trigger.
Try it sometime where there's PLENTY of space and you won't attract too much attention.