If you're trying to get it in single player, any pistol will work. The Desert Eagle is a good one, but the one with the most kick is the little revolver one, when you get the last barrel its like a one shot kill, the only downside to it is its like five or six shots then you have to spend a good amount of time reloading, which could be problematic. If you dont like that, then just go with the Deagle, good power, good ammo clip size, reloads quick, an all around good choice.