it should not be necessary in a GAS-OPERATED rifle like the M1, M14, or Remington semi's!
Sure it does. The sameprincipal applys.
The gas only creates a quick pulse that is quickly displaced before the bolt hardly begins to move.
There is still a spring applying pressure against the bolt pushing it foward. If the gunis moving to the rear at the same time the bolt is moving to the rearthen the bolt must move even farther and fartherto the rear in order to fully cycle.