Base Of Cartrioge Entering Tslot

Figure 92. Feeding—cartridge entering tke T-slot in the bolt.

the trigger pin, so that the trigger cam on the inside of the backplate engages, and raises, the rear end of the trigger lever, which, in turn, pivots on the trigger lever pin assembly, causing the front end of the trigger lever to press down on the top of the sear stud. The sear is forced down until the hooked notch of the firing pin extension is disengaged from the sear notch. The firing pin and firing pin extension are driven forward by the firing pin spring; the striker of the firing pin hits the primer of the cartridge, firing the round (fig 95 and 96).

b. For automatic firing, the bolt latch release must be locked, or held depressed, so that the bolt latch will not engage the notches in top of the bolt, holding the bolt to the rear, as in single-shot firing. The trigger is pressed and held down. Each time the bolt travels forward in counter-recoil, the trigger lever depresses the sear releasing the firing pin extension assembly and the firing pin, automatically firing the next round when the forward movement of the recoiling groups is nearly completed. The gun should fire about one-six-teenth of an inch before the recoiling groups are

Browning Bolt Locking
Figure 93. Chambering—new round alined with th4 chamber.
Browning Bolt Locking

Figure Locking-recoiling groups locked together.

23. Unlocking a. At the instant of firing, the bolt is locked to the barrel extension and against the rear end of the barrel by the breech lock, which is on top of the breech lock cam and in the breech lock recess in the bottom of the bolt (fig 94).

b. When the cartridge explodes, the bullet travels out of the barrel; the force of recoil drives the recoiling groups rearward. During the first three-fourths of an inch, the recoiling groups are locked together. As this movement takes place, the breech lock is moved off the breech lock cam stop, allowing the breech lock depressors (acting on the breech lock pin) to force the breech lock down, out of its recess from the bottom of the bolt (fig 97). At the end of the first three-fourths of an inch of recoil, the bolt is unlocked, free to move to the rear, independent of the barrel and barrel extension (fig 98).

c. As the recoiling groups move to the rear, the barrel extension causes the tips of the accelerator to rotate rearward. The accelerator tips strike the lower rear projection of the bolt, accelerating the movement of the bolt to the rear (fig 99).

d. The barrel and barrel extension continue to travel to the rear an additional three-eighths of an inch, or an approximate total distance of lVs inches, until they are stopped by the barrel buffer assembly (fig 100).

e. During the recoil of inches, the barrel buffer spring is compressed by the barrel extension shank, since the notch on the shank is engaged in the cross groove in the piston rod head.

Figure Locking-recoiling groups locked together.

fully forward. At the instant of firing, the parts are in battery, i.e., the proper position for firing. Only the first round should be fired with the parts fully forward. The gun fires automatically as long as the trigger and bolt latch are held down, and ammunition is fed into the gun.

Bren Gun Carrier Cal Browning
Figure 95. Firing—ready to fire.

trigger lever pin firing pin extension trigger trigger lever pin firing pin extension trigger

Browning Trigger Lever Pics

sear firing pin spring

Figure 96. Firing—round ignited.

sear firing pin spring

Figure 96. Firing—round ignited.

accelerator nvuVuUV,;ViVMVn,

BOCf accelerator

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Browning Cal Bolt Assembly

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