Multishot

Multishot weapon mods add 1, 2, or 4 extra projectiles for level 1, 2, and 3 mods respectively. To compensate for this large boost they also reduce weapon accuracy slightly.

Strategy
Mandarbmax says: These are my very favourite type of weapon mod. They are fantastic on single shot weapons, be they fast or slow firing, In particular, pistols, brass beasts, and black boxes benefit hugely from them. On the other hand, they do rather little for shotguns and almost absolutely nothing for melee weapons (because melee weapons have such large knock back so they can only hit once, no matter how many projectiles).