Firearms is a modification of Valve Software's computer game, Half-Life. It's a realistic modification of the game, that focuses on teamplay with gameplay altered to the extreme. Oh and did I mention this mod is loaded to the hilt with beautifully detailed firearms.
One of the greatest features in Firearms is that your abilities grow as you become a more skilled soldier. As a lowly private you can only take one of the available skills, varying from marksmanship to artillery, medicine and stealth. Depending on the choices you make, you can add a scope to your rifle or revolver, or even replace the barrel of an Mp5 with the silenced variant, a VERY cool option. As you go up in the ranks, you can expand your abilities to more than just the base skills, to a point where you are a master sniper, or walk without making a sound. The texturing is excellent, and the ambient sounds add to the general chaos of the battle. The new particle system is a joy, and breathes new life into the game with bullet effects that rival those of Action Half-Life. The bullet holes are significantly more realistic than the generic Half-life bullet holes in previous versions. On the same topic, the shell casings also got a workover, especially noticeable in the heavy machine guns. Download this already!