![]() The 9mm cartridge and its bolt was designed to cycle with blowback recoil, not gas. Some produce more pressure and require more dwell time to avoid over-pressurizing the receiver. Some rounds and barrel lengths produce less pressure. This is also why AR-15s have different gas system lengths. This is called dwell time, and it's why gas must travel down the barrel and through a gas tube before coming back into the receiver. But all that round's energy would 1.) quickly destroy the bolt and trigger group, or 2.) not cycle the bolt completely in a blowback-operated AR-15. That gas must expend more of its energy on the bullet itself before being harnessed to cycle the bolt. This is the only way to achieve the right amount of velocity a rifle round requires. It produces a lot of gas when fired, and burning all that powder takes time.
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