Game Gun Page - http://www.blackhall.net/GameGun.htm

ARMA 2

ARMA 2 is the sequel of ARMA : Armed Assault (ARMA : Combat Operations) and
from the authors of Operation Flashpoint : Cold War Crisis/Resistance/Elite.

ARMA 2 paints a plausible near future.
In 2009 the fictional post-soviet country of Chernarus is ravaged by civil war.
For two crippling years, conflict has raged…

SinglePlayer : Yes - Mission(s) & Campaign(s)
SinglePlayer COOPerative mode : Yes - Campaign(s)
MultiPlayer : Yes - 50+ players (64-128)
MultiPlayer modes : any possible COOP or PvP
Mission Editor : Yes 2D & 3D

ARMA 2 is being released (in NA region) on STEAM June 26th and retail July 7th
http://store.steampowered.com/app/33900/

Official website: http://www.arma2.com/

Serious Sam games can be played coop along with:
RavenShield
VietCong
SWAT 4
Full Spectrum Warrior

PC coop Games - BLACKHALL.net - Shaping Things to Come:

can you make that game with guns to