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That's what most refer to it as. It's a mini-14 stationary piston on the gas block. And the female side is on the bolt carrier/slide, no op rod. (Or integral op rod)
As far as I can tell the grooves are to self clean... No rings used.
Here's another nuance... Impingement depends on the velocity of the gas, where pistons operate more on the increasing volume and should work even at low gas velocities.
I've not tested, but my bet is an AR bolt would move with application of compressed air to the gas key nose. But a Hakim bolt would not. May have to try with a mini, need a way to block the chamber end to apply pressure.
Absolutely not! The Mini 14 is nearly identical to the M14, both of them being gas piston operated. There's an operating rod that actuates the bolt. I guess in some strange way you could say that the op rod is the carrier, since it's all one piece, but that's not going to hold water.
It's really very simple. You're just way overthinking it. DI means that the gas is routed directly into the carrier with no piston or op rod in between. If it has an op rod, then it's definitely not DI.
Like I said, I have no problem with the term stationary piston as long as its applied across the board. If you call the M14 a stationary piston, then you have to call the adam's arms gas block a stationary piston. Personally, I don't think it matters if the piston is male or female, it's still a piston. The gas acts upon it, and it uses that energy to actuate the bolt in one way or another.
Wow this thread title is misleading.
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