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Posted: 5/10/2002 6:04:45 PM EDT
After the second round is fired, the firing unit continues its rearward motion, while the bolt carrier and the hammer begin their next cycle. The sear is retained by the trigger plate.
After the second shot, the disconnector and the sear return into their initial position, the hammer being retained by the sear. The bolt carrier and the bolt, free from the hammer, complete their job by ramming the next round into chamber. At this instance the high-rate cycle is completed. The rifle commences its regular automatic rate of 600 rpm.
The firing unit, after the second shot, reaches its rear position and starts moving forward driven by the return spring and accelerated by an extra impulse of the buffer. The disconnector moves forward together with the firing unit. The hammer released from the sear, slides forward to hit the firing pin. The third round is fired. The firing unit begins to move rearwards. The bolt and the bolt carrier also move rearward. Immediately after the bolt carrier begins its motion forward, the sear catches the hammer. After the second shot is fired in a standard (600 rpm) rate, the disconnector interacts with the second shoulder of the trigger plate, which enables rate slowdown. At the beginning of return motion of the bolt carrier, the hammer is retained by the sear in its rear position. So, before the hammer is released, the firing unit completes its travel rearward, slams the buffer and begins to move forward. All these operations take extra time - the phenomenon which is called among the designer as "the time of exposition" or "waiting time". The greater the time of exposition, the slower the rate of fire. If at this instant the trigger is released, the trigger plate comes into its initial elevated position and disengages from the disconnector. Both the sear and the disconnector resume their initial position. The hammer is retained by the sear. The fire is ceased. To resume firing, pull the trigger. The whole cycle is repeated, i.e. two shots are fired in a high rate mode while other successive rounds are fired in a standard low rate. A noticeable interval between the end of the second shot and the beginning of the third one allows the operator to easily interrupt the fire by releasing the trigger. If the situation requires longer bursts, the operator can vary from the high rate fire to standard by longer depressing the trigger.
B. Two-round bursts.
To deliver automatic two-round bursts the selector should be placed in the "2" position. The safety is at the "O" mark. The rifle being loaded and the trigger depressed, the trigger plate comes into contact with the disconnected to turn the sear and to release the hammer. The hammer free from the sear comes off and the round is fired. The cycle of reloading, firing and interaction of mechanisms during the recoil cycle are similar to the operations in the high-rate phase of the variable full-auto mode.
The hammer is retained in a cocked position. The fire is ceased. To resume firing, first release the trigger. At this moment the trigger plate and the disconnector come into their initial position. The trigger is pulled again, the hammer comes off to hit the firing pin - the weapon commences the next two-round burst.
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