M2/M3 BRADLEY FIGHTING VEHICLE: TURRET - OD1609 LESSON 1/TASK 1
missiles can be loaded from the cargo hatch opening. Armor gives protection from
small arms damage to the TOW launcher and the missiles.
h.
25mm Gun. The 25mm gun can be installed or removed in three parts: barrel,
feeder, and receiver.
It has both electrical and manual fire control and is
externally powered.
The 25mm gun has dual feed capability. The 25mm ammo cans have 70 rounds of AP and
230 rounds of HE ammo. It can also fire single shot, 100 25, or 200 25 rounds
per minute.
When the trigger signal is received, an electric motor drives the track and bolt
assembly and the feeder. The feeder places a live round in front of the bolt, and
the bolt moves forward and locks.
The round is fired, the bolt unlocks, and the
spent case is extracted by the rearward motion of the bolt.
The rotor turns to
place the spent round into the eject chute while a new round is placed in front of
the bolt. On the next forward motion of the bolt, the spent round is ejected by a
finger on the bolt carrier.
To prevent the firing of a round in the open bolt position, a hangfire protection
system has been provided.
If the round in the breech does not fire immediately,
the bolt will stop in the misfire position, just before unlocking.
i.
25mm Gun Feed System. Linked belt ammo is stored below the 25mm gun in an
ammunition box that has two sections. The first section stores 70 rounds of armor-
piercing (AP) ammo and the second section stores 230 rounds of high explosive (HE)
ammo.
Each ammo belt feeds through its own forwarder and chute.
The forwarders
are manually operated and are used only during the loading of the ammo.
The
ammunition box has two sensors that tell when the 25mm gun is low on ammunition.
These sensors cause the LO AMMO indicator light to go on and automatically stop the
firing of the 25mm gun. This leaves the end of the ammunition belt in a position
that is easy to reload. The ammunition can be easily attached to the old belt. In
an emergency, the gunner can override the automatic shutoff by pressing the LO AMMO
OVRD button on the weapon control box.
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