Balthier's default weapons are Guns, but in FFXII the character aren't restricted to their default arms alone. You can choose to teach your partymembers whichever weapons you desire, be it longrange like bows or closecombat like katanas or daggers. I've taken Balthier down on the licenseboard towards the hammers and axes. I've always been one for brute strenght and if levelled properly he most often doesn't do halfbad damage with the one-hand closecombat weapons.

It's hard denying Balthier looks mighty cool as a gunslinger and since it is his default weapon, here is a list of all the guns that can be found throughout Ivalice. An interesting fact is that they are all named after stars!

The Guns in FFXII
	Name	LP	Attack	Cost
	Altair	30	+6	500
Location: Rabanastre, Bhujerba, Nalbina, Balthier's default weapon
	Capella	30	+10	1400
Location: Rabanastre, Bhujerba
	Vega	40	+14	2400
Location: Rabanastre
	Siris	40	+18	4000
Location: Rabanastre, Jahara
	Betelgeuse	50	+22	5400
Location: Mt. Bur-Omisace, Jahara, Nalbina, Ranabastre
	Ras Algethi	50	+26	7000
Location: Rabanastre, Labina, Mosphoran Highwaste
	Aldebaran	60	+30	10000
Location: Phon Coast, Archades
	Spica	60	+34	13000
Location: Balfonheim
	Antares	80	+39	16000
Location: Balfonheim
	Arcturus	80	+44	19800
Location: Sell Yensa Fin x2, Wyvern Wing x2, Salamand Halcyon x1 to Bazaar
	Fomalhaut	150	+50
Location: Treasure in Cerobi Steppe, The Lhusu Mines, the Pharos

Like all ranged weapons in FFXII guns require you to equip ammunition. Most of them are elementally based but some also add status effects. The following ammunition can be found throughout the game;

Gun Ammunition
Name	Element/Effect	Attack	Cost
Onion Shot		+1	100
Location: Nalbina, Jahara, Mt. Bur-Omisace
Silent Shot	Silence	+1	1680
Location: Sell Fish Scale x2, Green Liquid x1, Dark Stone x 3 to Bazaar.
Aqua Shot	Water Element	+3	2980
Location: Sell yensa Scale x1, Green Liquid x3, Water Stone x4 to Bazaar.
Wyrmfire Shot	Fire Element	+3
Location: Back to Barheim sidequest reward.
Mud Shot	Earth Element, Blind	+2	9080
Location: Sell Ichton Scale x4, Silver Liquid x5, Wind Crystal x7 to Bazaar.
Windslicer Shot	Wind Element	+4	15200
Location: Sell Ring Wyrm Scale x4, Silver Liquid x5, Wind Crystal x7 to Bazaar.
Dark Shot	Dark Element	+4
Location: Hunt reward for Rank V. The Black Sorcerer
Stone Shot	Petrify	+4	15000
Location: Srell Mirror Scale x2, Tyrant Bone x2, Libra Gem x3 to Bazaar