Okay, I might have outdone myself on this one. This massive WW1-2 era Mod pack has weapons from both sides, as well as some of the neutral parties. Here's an overview.
-Most common American weapons (Tommy gun, M1 Garand)
-Most famous German weapons (Mp40, Kar98k, MP44)
-Loads of other Allied and Axis weapons (STEN Gun, Lee-Enfield)
And there's more that I haven't listed! All weapons have custom ironsights and sounds, and the pack also includes an extraneous Sound Pack with Footsteps and UI sounds.