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Half-Life: Opposing Force Hints
M-40A1 Sniper Rifle
The M-40A1 sniper rifle is the best weapon for long range and precision-made shots. If you want a dead-aim headshot on your favorite enemy, take out your sniper rifle, switch to your scope (secondary attack) and line up your sight. The sniper rifle is very slow at both resetting a shot and reloading a clip. It uses 5-shot clips with 3 clips (3 * 5 = 15 bullets) carried. It cannot be used underwater.
Also note that if you load a saved game while the sniper rifle's scope is on, then it will remain on no matter what weapon you have readied. However, this can be inconvenient, so either ready the sniper rifle and hit the secondary fire button a couple of times, or just quit and rerun the entire game.