I've seen the claim several times that gas tube length, dwell time and gas port size can increase or decrease recoil energy.
I don't mean perceived recoil nor do I mean how sharp or soft the recoil feels but the actual amount of energy generated during recoil. All else being equal, does a midlength rifle actually kick less than a carbine length? Or is it just a softer recoil as the impulse is spread out over a longer time?
If the carbine length does generate more recoil energy, where is the empirical data to show this?


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