Max (Mel Gibson) carries a sawed-off shotgun, an older model with exposed hammers (unlike the shotguns he carried in the first two movies). It's used only once in the beginning of the movie against a Bartertown guard. Max turns in his weapons as a condition of entering Bartertown, but forfeits them when he is banished for "busting a deal."
A Mauser C96 pistol is among the many handguns that were in Max's (Mel Gibson) possession before they were confiscated from him by the Bartertown authorities. Could be the same gun that was used by Bubba from the first Mad Max.
A Smith & Wesson 29 is amongst the many weapons surrendered by Max's on his entry into Bartertown. Note that this pistol is not Lord Humungus' piece from Road Warrior, which - besides sporting a scope - has a substantially longer barrel (8 inches on the 29 in Road Warrior; 6 inches at most in Thunderdome).
A Lee-Enfield is seen holstered on a Motorbike Sidecar during the train chase scene but is not used, one is also seen in the hands of a Bartertown citizen.
An M1 Carbine is seen wielded by the Pilot's son, who is also armed with a shotgun at the end of the railway line but are not fired. An M1 Carbine is also part of the tribal spear carried by Slate, the eldest of the male "waiting ones." When Savanna threatens to leave the camp, Max "borrows" it from Slate and removes the spear point affixed to the underside of the barrel. A closeup of the chamber is visible when Max chambers a round and while the manufacturer is unknown, the numbers 30 are clearly visible. Also the round chambered is very short, typical of that of the .30 Carbine round. A closeup of the muzzle is shown, as well as the rear peep sight is clear when Max shoulders the rifle.
Jebediah, the Pilot's son, attempts to rob Max and the others with a Stevens Single Barrel Shotgun with some kind of expanded barrel and an M1 Carbine.
Some scenes have too many guns on scene, which in turn are also hard to identify.
Error creating thumbnail: File missingSome pistols are seen hanging behind the weapons collector's head.Error creating thumbnail: File missingBartertown guards pull their guns on Master-Blaster. A few are identifiable: There appears to be a double-barrel shotgun at the top; a Mossberg 500 without a fore end, and a home-built rifle, reminiscent of a Browning Automatic Rifle, with a pistol grip and massive MG 81-style flash hider, at the bottom.Error creating thumbnail: File missingMore guards, more guns. Hard to tell what they all are.