Lock and Load: The Reassembled Machinist Guide

[Deus_ex_Machina]

... Gauss Barrel....?

You can keep it on the whole fight, there is not a real issue there. Btw, all proc'ed slug and clean shot are instant cast with Gauss barrel on in case you didn't know. Min/Maxer will turn it off when they have exhausted all of their offensive cooldowns (blank, head graze and gauss round) for 2~3 gcds and then turn it back on for hotshot/leadshot. You can have it off for hotshot, but always have it on for leadshot. Stance dancing generally gives you a minimal dps increase, not a game changer.

Example to turn it off and on: You have used all blank, head graze and gauss round, you do not have a proc'ed shot. Turn Gauss barrel off, fish for a proc'ed slug shot, (then quick reload if available), turn it back on for instant cast slug shot (potentially proc'ed clean shot)