One-tap Gunblade, solves all of your shielded opponent-troubles in a matter of seconds.

This one is purely designed to remove all shields that bother you and let you focus on taking down health instead of cursing on that blue line all the time, this is one of my Index weapons used with [Vigorous Swap] since it is easy to activate the buff with a single tap on the melee button before aiming and immediately switching to a different weapon.