Most versions require you to wear specific hats (like the "POW" hat) to function as the base for the laser arm.
: Users typically activate the laser by holding down a mouse click, which fires a neon beam from the avatar's arm toward the cursor. Server-Side Impact FE Laser Arm Script
Unlike a simple "move here" command, the FE script uses interpolation to ensure smooth motion. Most versions require you to wear specific hats