Ironsight is a futuristic military themed first person shooter by South Korean developer Wiple Games. The game is due to release next year but they will launch a closed beta on November 14 for Western PCs.
Judging from their trailer video, the multiplayer matches looks fast paced and it has a huge resemblance to Call of Duty games.
According to PC Gamer, it has a variety of game modes and 14 maps available so far. It has an impressive arsenal of 100 guns which you can unlock and customize as you gain EXP through kills, as well customize your character skins.
If you are interested, then signing up on their website might actually be worth it.