The Antiaircraft .50 Caliber Machine Gun
The Browning Machine Gun, .50 caliber, M1921, is recoil operated, belt fed, water cooled. The gun weighs 88 pounds with the water jacket filled, 66 pounds without water. It has a maximum rate of fire of 650 rounds per minute. This rate can be cut down to 400 rounds per minute by adjusting the oil buffer, but it has been found that the gun will not function automatically with the cyclic rate cut down this low. The best results are obtained with the cyclic rate of fire adjusted to 600 rounds per minute.
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