Barret’s explosive gun arms

Barret’s loud and dangerous gun arms can be found scattered throughout the world, but note that you won’t find a new one after Chapter 2 for a little while.
Gatling Gun – Starting Weapon. Grants Focused Shot
Hi-Caliber Rifle – Chapter 2: swamp, Grasslands. Grants Bonus Round
Barrage Blaster – Chapter 7: Railway Control Tower, Corel Mines. Grants Lifesaver
Vulcan Cannon – Chapter 8: Scrapyard Prison Cell, Corel. Grants Charging Uppercut
Fafnir Rifle – Chapter 9: Gongaga*. Grants Point Blank
Calamitous Bazooka – Chapter 10: Gate of Anger, Cave of the Gi, Cosmo Canyon. Grants Smackdown
Battle Cry – Chapter 13: Corridor of Catastrophe, Temple of the Ancients. Grants Turbulent Spirit
*Complete the sidequest “The Pursuit of Perfection” to earn this weapon.