Was thinking about this earlier, specifically. I'll bet it plays hell with piston systems. Piston systems still being operated by gas, with a very short trip (the smallest, shortest gas system?). That gas goes up the gas port, directly into the "manifold" that houses the piston, and the operating rod is a direct link to the BCG. In a gas tube, at least the longer gas tubes have to "fill and pressurize" in order to move the BCG. Once that magic pressure is reached, the BCG begins its trip rearward. Not so on a piston system...