Leviathan.Comeatmebro said:
»Augment on the feet is very handy. Leg augment is also great(I think it's legs anyway, the snake eye one). Head if you meritted winning streak for legion.
This. Augment on feet are for Wild Card macro, and leg augment is for Snake Eye macro. Feet are also best Quickdraw feet for any shots other than Fire.
Seha's guide is very comprehensive, highly recommend you read that as it answers this question, and likely any others that you will have.