Sometimes an Arm Cannon just isn't cool enough.

This is when a projectile weapon is mounted on an unusual spot on a character or vehicle.

This includes shoulder mounts and the like.

EXAMPLES:

• The infamous shoulder-mounted, servo-turret plasma cannon used by the Predator. It is aimed using a targetting laser in the Predator's mask, which means it can accurately aim and fire while keeping its hands free.
• Shoulder-mounted weapon batteries are a staple of Real Robot mecha.
• Big Guy from Big Guy And Rusty has a ridiculous amount of missiles and machine guns mounted in its armpits!

(P.S.: Do we have a separate trope for wrist-mounted guns? If not, I feel we should, since it tends to work differently from the Arm Cannon.)

(P.S.S.: Edited title to be more universally understandable. Also, apparently wristguns are covered under Arm Cannon. Very well.)