Here's something I would like to recommend: Fistful of Frags!
Do you like Henry rifle? Have you watched the Dollars trilogy? Does getting drunk on whiskey and shooting someone with a double barreled shotgun sound like a fun evening? Read on
It started as a mod, and now they've made a standalone version of it, which you can get on steam for free.
Right now the game has only 6 maps and 2 modes (deathmatch and team deathmatch), but they keep porting them over from the mod version. It's a good old shooter with lots of focus on the accuracy of your shots, rather than COD style praying and spraying, since you rarely have more than six shots, and reloading takes about 5 weeks. There's no unlocks system, but you can find crates with weapons around the maps if you can get to them alive that is
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It's freez and made of awesomz so put on some Ennio Morricone and pass the whiskey.