How to change the shooting mode of the SC-20K in Splinter Cell 1? What bullets are fired by pressing the right button?

Press Z to switch between multi-shot/single shot

There are more things that can be shot by right-clicking:

Induced camera: after shooting, the field of view will become the field of view of its camera. You can also press 2 and 3 to switch between night vision goggles and thermal imaging cameras, and scroll the mouse wheel to zoom in and out and recycle.

Shocking Ring: If you shoot the enemy at the head, it will stun it with one blow. However, if it hits other parts, it will only cause a slight shock. You need to shoot it one more time to stun it.

Electric shock bomb: After hitting the enemy, the enemy will be stunned by the electrode. The difference from the ring is that the trajectory is parabolic. It must be aimed above the target to hit, and no matter where it hits, it will be stunned.

Booby mine: After equipping it, press the left mouse button toward the wall to install it. If you want to remove it, walk towards the booby trap in the slowest crouching position and approach until the words "Disable wall mine" appear. Wait until the booby trap flashes. Press Space at the moment the light turns green to remove it.

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