![]() ![]() Another mechanical feature preventing this is the tail of the bolt slide, which keeps the hammer out of contact with the firing pin until the bolt is locked. Since the disconnector can’t reengage the sear until the trigger has been completely released, the rifle cannot be fired full auto. The bolt then gathers the next round from the magazine, starts it toward the chamber, and raises the hammer into engagement with the sear. By this time, the action spring has been fully compressed and reacts by starting to move everything forward. In addition, the tail of the bolt sleeve depresses the hammer past the cocked position to disengage the sear and the disconnector and compress the mainsprings.Īll this activity is halted when the action’s rearward movement is stopped by the inertia piece striking the buffer and buffer plates, which are located in the front end of the receiver. Extraction and ejection take place as the bolt is on the way to the rear. Once the bolt is completely unlocked, the timing latch cams into the bolt sleeve to keep bolt and barrel lugs aligned until the bolt is returned forward. During the process, the timing latch engages a slot in the left side of the receiver. At the same time, the cam pin rotates the bolt, unlocking its lugs from those in the barrel. This begins to compress the action spring. Picking up the momentum of the inertia piece, the bolt sleeve is driven rearward. The gas piston travels about 5/8 inch before contacting the inertia piece, which is connected to the bolt sleeve by action rods. Any excess gas is bled off through the gas regulator. The firing pin moves forward, compresses the firing-pin spring, then strikes and ignites the primer of the cartridge.Īs the bullet moves down the barrel, it passes a port where propellant gas is bled off to drive the gas piston to the rear. The hammer, driven by two springs, strikes the firing pin. When the trigger is pulled with the safety off, it rotates around the trigger pin, allowing the disconnector to move forward and disengage the sear from the hammer. The rifles are equipped with a cross-bolt safety to block trigger movement when the safety is on. The magazine capacity of the BAR is four rounds regular, three rounds magnum. As a complete assembly, however, trigger guards are interchangeable. Old and new style receivers are not interchangeable, nor are the butt stocks, stock bolts, stock butt plates, triggers, or front and rear sights. The old style’s receiver is flared, with its rear end thicker than its center. The new style has a flat receiver with both sides parallel. Outside of that, it’s much the same rifle Browning brought to Washington in 1917. Its civilian dress differs considerably from its GI garb, and, of course, the civilian model is not capable of fully automatic fire. Military, the BAR made a successful transition to the sporting firearms market. While both designs-or refinements thereof-are still in service with the U.S. It wasn’t until World War I hit home in April that Browning’s machine gun joined it. The Browning Automatic Rifle (BAR) was an immediate hit. The other was a rifle light enough to be carried by a foot soldier, fired from the shoulder or hip and instantly convertible from single shot to fully automatic fire at 480 rounds per minute. ![]() 30 caliber, water-cooled machine gun capable of discharging 600 rounds per minute. Little more than a month before the United States entered the war against Germany in 1917, Browning officially demonstrated his two newest brainchildren for an audience of senators, representatives, military officers, and assorted members of the press. With no war in sight, the Army wasn’t interested at all. Naval Ordnance was somewhat interested, having talked over the need for a lightweight gun that could serve with landing parties as a replacement for the 90-pound Gatling gun. 45/70 caliber prototype-it smoked up the Colt factory’s firing tunnels by letting loose 200 rounds at six rounds per second without a hitch. Browning demonstrated his first machine gun-a.
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