Originally Posted by
OldState
I don’t mean to participate in the derailment of a thread, but you can’t “mathematically” eliminate energy. This is simple physics. The same energy is realeased firing the same cartridge regardless of what it is fired in. The midlength is simply allowing the recoil energy to be distributed over a longer amount of time giving the perception of less recoil....as was said in the post before. So instead of the rifle giving you a quick “punch” you get a shove. You could also achieve the same perception by making the rifle heavier, etc.
Still a good thing no doubt and would theoretically allow the shooter greater control and cause less stress on the rifle.
Like if you were to jump off a 6 foot platform and land with your knees locked vs bending them to deliver the energy slower.
Does an immobile bolt carrier group (BCG) exhibit any recoil energy? The answer is no. Does a BCG propelled at a speed of 3.23 feet per second (fps) as a result of the discharge of a cartridge exhibit recoil energy? The answer is yes. CRANE measured a 3.23 fps BCG speed decrease in the mid length gas system compared to a carbine length gas system. Gas pressure decreases with every inch of travel in the barrel. Reducing the amount of pressure applied to the BCG definitively reduces the amount of recoil, both measured and felt. The mid length gas port is further down the barrel from the location of a carbine length gas port, therefore it has less pressure available to send to the BCG. Pressure is what causes the BCG to recoil. Hence, mid length gas systems factually and perceptibly produce less recoil than carbine gas length systems.
The recoil energy of the BCG directed into your shoulder is measurable and tangible. The faster you move the BCG towards your shoulder the greater the amount of very real and measurable recoil transmitted to the shooter. This is neither subjective nor theoretical. BCGs move significantly faster in carbine length gas systems compared to mid length gas systems when firing identical cartridges in each.
Carbine length gas systems in fact produce more recoil than mid length gas systems. Science, math, and shooter perception all confirm this truth.
“All the people constitute the militia – according to the Founding Fathers. Therefore every able-bodied man has a duty under the Constitution to become part of the ‘well-regulated’ militia, specifically to understand and perform well with the individual weapon currently issued to the regular establishment …. Thus one who has not qualified himself with the M-16 may not be considered to be a responsible citizen.”
Colonel Jeff Cooper, USMC May 10th, 1920 - September 25th, 2006 WWII Korea
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