At Rank 10 you gain access to Mesa’s Exalted Weapon, twin pistols known as the Regulators. While holding down your fire button, Mesa will automatically fire an unlimited stream of bullets at any targets you line up in the reticle up to 50m away. As you fire, your targeting reticle will decrease, requiring a bit more aim, but in exchange you receive a damage bonus up to 150% after 20 rounds. Your Firerate will also increase with each shot, leading to an onslaught of bullets. Additionally, each round has a 300% Crit Multiplier, 25% Crit Chance, and 10% Status Chance across a 50%/25%/25% I/P/S damage split. This ability does come at a cost, though. Using the Regulators causes Mesa to stand her ground, fixing you in place. This will make you an easy target for Ranged Enemies so be sure to activate Shooting Gallery and Shatter Shield to increase your Survivability. You can activate Peacemaker while moving though. Doing so after Bullet Jumping, for example, will allow you to fire while still maintaining some mobility.
Augmenting with Mesa’s Waltz removes one of the main obstacles, allowing you to move at up to 50% your speed. Though still slow by normal movement, it makes a large difference being able to get around cover for yourself or draw a bead on hiding enemies. As this is a channeled ability, Duration and Efficiency mods can greatly increase how long you maintain the Regulators. Adding Strength will push your Damage Bonus higher while Range will alter your Reticle Field of View.
The Regulators themselves are not tied to how you mod for Ability Strength. Instead, they are tied to how you modded your Secondary Weapon. Putting on Fire Rate mods is also very beneficial to ramp the boost up faster and further up your DPS. Remember, you have Unlimited Ammo and never have to Reload, so you can fire continuously as long as you have the Energy.