Tracer ammo is, I would think, exceedingly scarce by 2000. Probably to the point that most units just don't have any available at all or maybe keep some (and other pre-nuke small arms ammo) set aside for major conventional combat ops and use lower quality reloads for marauder suppression and small scale raids and such.
Machine gun sights are mostly pretty crappy if you're free gunning and not working a T&E on a tripod. MGs overcome this by using tracers -- so I wouldn't give a bonus for tracer use, I'd give a penalty for it's absence. The solution would be a spotter with optics calling fall off the shots and making adjustments.
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