Not exactly... that is the conventional theory and true for two rifles that do nothing but fire a projectile - if all other things are identical, the lighter of the two rifles will have a higher recoil.
But keep in mind that a lot of the potential energy from firing the cartridge is lost as heat, light and noise; if we capture some of that energy (in the form of high pressure gas at the gas port) and turn the potential energy into work (as in accelerating the BCG), the additional kinetic energy from buffering, slowing, stopping and returning the accelerated BCG will add to the recoil... the faster the bolt carrier accelerates, the more kinetic energy.
In the famous Dual M4 High Fidelity Gymnasticator, the top rifle is fired but the gas is directed to cycle the BCG in the bottom rifle - the bottom rifle is still going to have "recoil"... even though it was not fired, that recoil generated by the bottom rifle would be in addition to the "equal and opposite" reaction the top rifle experiences from firing the projectile.
In theory, the combination of recoil from the top and bottom rifles would be equal to the total recoil if the rifle was fired in it standard configuration, but you have to admit that part of that "total" recoil impulse is generated by the BCG, independent of the actual opposite reaction of accelerating the projectile... therefore the more kinetic energy that BCG makes, the greater the recoil will be.



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