Squall's Weapons

Revolver
Needs: 6 M-Stone pieces, 2 screws. You can find that stuff pretty much anywhere.

Shear Trigger
Needs: 1 Steel Pipe, 4 screws. You can find steel pipes in the Roswell Forests near Timber. Screws are everywhere.

Cutting Trigger
Needs: 1 Mesmerize Blade and 8 screws. The Mesmerize Blades can be obtained by Card Mod-ing a Mesmerize card. Mesmerizes appear Trabia Garden.

Flame Saber
Needs: 1 Betrayal Blade, 1 Turtle Shell, and 4 screws. The Betrayal Blades are from skeleton guys called Forbiddens in the Tomb of the Unknown King. The Turtle Shells are from Armadodos in the Tomb of the Unknown King.

Twin Lance
Needs: 1 Dino Bone, 2 Red Fangs, 12 screws. The Dino Bones are from T-Rexaurs that appear in the Balamb Training area. The Red Fangs can be gotten from changing three Level 4 Meruto Dragon cards.

Punishment
Needs: 1 Chef's Knife, 2 Star Fragments, 1 Turtle Shell, 8 screws. The Chef's Knife can be gotten from Tonberries in the Sentra Ruins, the Star Fragments can be gotten from Iron Giants near Estar. See Flame Saber for the Turtle Shell.

Lionheart
Needs: 1 Adamantine, 4 Dragon Fangs, 12 Pulse Ammo. The Adamantines are from Adamantoises on a long peninsula near Deling City called Long Horn Island. The Dragon Fangs can be mugged from Meturo Dragons, who appear on Hell Island. The Pulse Ammo can be gotten by refining 2 Energy Crystals that you can get from this odd black monster standing on the highways of Estar.