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).
Last group of hand-held weapon's muzzleflashes was edited: FG42 (same style goes for MP44), PTRS (basically enlarged SVT40 flash), MG42 (same style goes for MG34, BAR, 30cal, Bren, ZB26) and finally a DP28. Note that portable MGs emit tracers when firing (green for Russians and yellow for everyone else).
MG42's flash has a cetral part + mutliple flashes coming from its recoil booster. Also note the yellow tracer. All machine guns except from Russian ones have yellow tracers.
Imagine yourself getting shot by the MG42 and you see the Tracers coming at you
Scary
Tracers typically aren't very visible when they're coming at you, as the tracer element is on the rear of the projectile. You'd be unlikely to see (or hear, given the supersonic rounds) anything before you were dead.