Here's a list of some free shooting games for PC.
America's Army (AA)Is a tactical multiplayer shooting game presented by the United States Government. The gameplay encourages teamwork, knowledge, patience, and stealth. The ingame graphics look great and the game has options for high end and low end PC's. The one thing that bothered me was the crappy muzzle flash and the slowness of the actual matches. This game offers a somewhat new experience that doesnt appeal to everyone but is still very fun to play. 4/5 stars
Wolfenstein enemy territory: This game offers an excellent multiplayer experience. The game's ****relates to the battlefield series, where players select ****s with different weapons and abilities. The game has all the weapons one could ask for including flamethrowers, mg's, thompsons, rocket launchers, snipers, and plenty more. The gameplay is mission based, some maps require one team to protect a tank while it moves on a given path, while the enemy team has to set up barricades and destroy the tank. One of the best key points in the game is the ranking system, the more kills, revives, or repairs you get, the higher you rank. As you rank up you get more ammo, dual pistols, more accuracy, and new weapons and abilities. 4.5/5 stars
Warsow: This game is very similar to a quake or unreal deathmatch. The game has several touches that differentiate it from these titles. The main feature are the colourful cell shaded graphics which makes the game look excellent. Also, many moves are available such as wall jumps and double jumps. The weapons feel balanced and the game is fast paced. 3.5/5
Soldier front: Soldier front (commonly abbreviated SF) is a first person shooter hosted by ijji. The game is most notable for its tactical gameplay similar to that of the counter strike series. Although Soldier Front is played via installed client but a Internet Explorer browser is required to launch it. The games graphics are not great and are a little better than half life 1 or counter strike. The game features a store where playersrent items for money which is earned by getting kills. Although the game is fun, it tends to get boring after playing it a lot. 3/5
Warrock: This game has extremely similar mechanics to soldier front, it features the same store and purchasing options but takes the game to a whole new level. The graphics, although not great, are acceptable, they are similar to an xbox games graphics like halo. The game also features land, air, and sea combat which adds tio the fun. 4/5