In Opposing Force you get the some of the old weapons for the original Half Life along with at least seven new weapons. You play as a Grunt on Opposing Force this time around, so you're going to have to access different types of hardware, and some better weapons.

	Wrench Say good-bye to your old crowbar, and say hello to this new more powerful Pipe Wrench. With the new pipe wrench you can use the secondary fire, and it'll be a more powerful swing, crushing almost crush any crate in one swing.
	Barnacle Remember those things hanging down in Half-Life, where if you touched one you'd be sucked up to the ceiling? Well now it's a weapon, you can use it as a grappling hook, use it's tongue to suck enemies in, or you can use it to swing through the air.
	.357 Desert Eagle Just like the magnum from Half-Life, but it has a better design, and also has an alternate fire laser sight.
	M-249 SAW Lets just say this is one hell of a gun, and it'll send out the bullets as fast as you can hold the trigger.
	Displacer Yes, its another one of those experiments, you can fire teleporters at your enemies, or teleport yourself to Xen.
	Shock Rifle For all those Unreal Tournament people out there you probably know what this is.
	Spore Launcher This alien biological weapon is basically a biological grenade\rocket launcher. Fun with Spores -- there's nothing like it!