This example map accompanies the TWHL Wiki page on stripping and equipping weapons in CS. It features the weapon in a locker from the tutorial as well as a few other random examples.
Other examples include a bunch of different buttons that simply trigger different game_player_equip
entities, a single button that strips and equips and then changes to a different target, and a doorway with a trigger_multiple that targets a player_weaponstrip
.
You need to include halflife.wad in your editors setup for Counter-Strike if you haven't already (or you could just replace the textures, either way works).