Comment 13 for bug 894991

Maybe we just drop one?

What's your argumentation? "We shouldn't put Ammo on weapons because there might be minor graphical glitches if and only if an ammo pip is displayed?"

Seriously, I recognize the issue (it's not the first time I thought about that - the request is old, after all), but that's a pretty minor thing.
As said, maybe we just don't show the secondary, or switch pips depending on which weapon is active.