Even though it is useless and you won't hit anything, dual wielding guns and firing them is a lot of fun, I've done it with .22 handguns, .38 revolvers (two M&P Model 10s) and two 1911s.
The only time I can see wielding two guns as being effective is if you were in a tight space with multiple people on each side of you. Like people such as Wild Bill Hickock, who were ambidextrous and very professional with firearms. He had a gunfight in a bar where he used his Navy Colts to gun down four men, simply aiming deliberately and shooting. Of course reloading would be a bitch so bring holsters so you can focus on one at a time. Or buy those wicked awesome magazine loading things from Tomb Raider that allow for one handed reloads.
__________________
|