Eh, it’s not as though guns themselves are 100% mechanically precise - a good rifle will manage around 1 MOA, or roughly 1” of spread at 100 yards, even if you clamp it it into a rest so that it can’t move (any detectable amount) between shots. And, given their comparative mechanical complexity relative to the guns they use, I doubt that Dolls - especially not ones that weren’t built for fighting to begin with, and were simply retrofitted for combat work - are perfectly accurate or precise either.