Not to be a #### but I would trust my life to a firearms giant like FN Herstal way before I do to a nobody like Kel Tec. IWI, haven't heard any reports of them going KB, but I can't imagine it would be a pleasant experience seeing it's right beside my face. I haven't seen any ar like HK416 or knights or DD ever take off the face, some lacerations on support arm , but even that is rare. There was a site about the HK416 squib detonation tests, I can't find it anywhere anymore, maybe you will have more luck. The barrel bulges and not much else happens, the gun makes a loud noise, the mag pops out, guy popped in a new mag and it still shot.
Here is a 416 otb test with a sauceboss techno theme. The standard ar breaks away from the operator with no serious injury.
http://www.youtube.com/watch?v=vjMH94PuT_I
The RFB has two layers of steel plate protecting your face in case of a kaboom.
It doesn't take a firearms giant to have an engineer capable of designing a firearm to direct the explosion away from the shooter. As long as there is an easier path for it to go it will.
You may notice in the slow motion portion of the video you linked that the top of the receiver blows off and either bounces off his helmet or goes very close to it. So even the mighty AR (which I own 3 of) can still explode and hurt the operator. Granted the standard DI AR was not designed to be shot full of water so that is kind of a silly test to perform and really doesn't show the superiority of HK, it only shows that a piston gun can cycle full of water. Which is also stupid to do since even though it may cycle you are pretty much guaranteed to ruin your barrel.
I don't care what brand or type of firearm I'm shooting, I don't want it to explode in my hands. I had an HK USP Tactical kaboom in my hands and while the pistol did a fairly reasonable job of holding itself together my hand was tingly for a couple hours and I had little pieces of polymer stuck in my hand for a couple days. Bad handload was the culprit.
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