Run. Think. Shoot. Live. Source. BMS Classic is a game-wide modification of Black Mesa that aims to revert some of the changes made in the 1.0 and 1.5 updates, as well as fix various bugs and oversights, improve performance, and reimplement missing setpieces and sequences from the original Half-Life - removing self-locking doors, allowing the player to backtrack and explore at their own leisure, restoring puzzles, rebalancing combat and supplies, and more.
The pistol by the dying guard shortly after the crowbar has been removed, and the HUD tooltip has been put in the later security office instead. This forces the player to rely on the crowbar in combat for a brief period.