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Like Chili said, the cartridges in the mag are putting more pressure on the bolt carrier when the mag is full...but as the mag gets to the last rounds, the pressure is less. The weaker pressure allows the rotating bolt to rotate faster, causing greater centrifugal force, which will make the...

Like Chili said, the cartridges in the mag are putting more pressure on the bolt carrier when the mag is full...but as the mag gets to the last rounds, the pressure is less. The weaker pressure allows the rotating bolt to rotate faster, causing greater centrifugal force, which will make the...