You can play Gun Battle in a99io.com as unblocked.
After entering the server in Gun Battle game, you will fight with your other opponents and you have to defeat them. You can move your character with the W, A, S, D keys. You can fire automatically with the "Left Mouse Button". You have to play very carefully to defeat your other opponents. You can buy New Skins for the gold you earn from the "SKINS SHOP" section. The game will restart when all opponents are defeated.