Back2Fronts is an extensive mod that will overhaul your Call of Duty 2 game to a next level. This mod brings more variety, intensity, realism and battle-like experience. Try new weapons, fight new enemies, fulfil new missions and explore new options. Mod is SP and MP friendly (although primary part is SP).
Some weapons in real life have a specific feature that you can tell if they are out of ammo ("empty"). I have included this feature to some extend to the B2F mod. As a result some weapons get empty idle anims - for example SVT40, G41, G43, DP28, MG42, MG34 etc.
The G41 is out of ammo ("empty"). You can tell that the bolt is in opened locked position. Same goes for G43.
As for the MG34/MG42 - their ammo belt is all spent in the "empty" state. And for the DP28 - the bolt is in forward position.
What about pistols, m1 garand, etc.
Oh yes, I forgot. Garand, 30cal, Beretta 38 SMG and Thompson have that feature as well.
But pistols won't have it so far. Too much work for now. Maybe in future patches.