Using it in small rooms is also efficient, since it bounces on the walls, floor and ceiling. They are efficient on lined up enemies, since it goes through them all before it hits a wall.
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Furthermore, the player can only hold three full magazines (that is, one in the gun, two spare), which are easy to go through if firing in automatic mode. The weapon's spread is much worse when firing the weapon in automatic mode, so firing it in short bursts is highly recommended (this also conserves ammo).
A Dark Energy Ball shooter is built into it, in which the orb is capable of disintegrating almost anything it touches.
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Said magazine considered an optional upgrade in Half-Life: Alyx, suggesting the box magazine might be a more recent addition to the standard issue weapon design. It has a 30-round energy cells, which is reloaded with an automatic mechanism built into the weapon from the box magazine.
Rebel firing at the Hunter-Chopper in the Outlands with his OSIPR.