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From HalfLife 2 Knowledge Base

A SLAM in throw-mode.

The SLAM, although cut from Half-Life 2, has made its appearance in Half-Life 2: DeathMatch. It has two modes :

Throw mode : The SLAM is thrown about 10 metres from you. Tripwire mode : When close to a wall, a laser is revealed, after which you can plant it at the nearest wall in tripwire mode. The red laser becomes activated and when someone (or something) crosses it, it explodes.

A SLAM, ready to be placed.

Activated SLAM.

The SLAM from the old HL2 build.