Quint (Robert Shaw) keeps an M1 Garand aboard his boat and is seen using it during the shark's night attack. Quint is a world war two veteran who survived the shark attack on the USS Indianapolis. Some people believe Quint has had the rifle ever since he was on the USS Indianapolis. Chief Martin Brody (Roy Scheider) uses the Garand against the shark at the climax of the film. Several Coast Guard members are also armed with M1s, most notably when they surround the two boys wearing a fake shark fin.
M1 Carbine
One of the men patrolling the waters on the Fourth of July is armed with an M1 Carbine. The rifle, which is often without a magazine loaded, appears to be fitted with adjustable rear sights as seen on post-WW2 M1 Carbines, but without the bayonet lug.
Smith & Wesson Model 15
Chief Brody (Roy Scheider) uses a Smith & Wesson Model 15 revolver as his issued sidearm and uses it to fire several shots at the shark as it passes the Orca.
Greener Light Harpoon Gun
The harpoon gun used by Quint (Robert Shaw) is a Greener Light Harpoon Gun with a nickel finish. He stores the rifle in its original take-down case, and the line holder has been removed from the forend and the reel is instead attached to the ship to handle bigger fish like sharks.
12 Gauge Double Barreled shotgun
During the chaotic point in the movie, when the fishermen descend on the town in search of the reward on the shark, one of the hunters carries what looks like a Stevens 311A 12 Gauge Double Barreled Shotgun. This is from a deleted scene that can be viewed in the 30th Anniversary Edition's extras features.
Arisaka Rifle
When posing with what they believe to be the shark causing all the carnage, one of the men in the group (at the far right) carries what appears to be an Arisaka Type 38. Not implausible; the movie was filmed in 1974 and war souvenir firearms were still very plentiful and affordable.
Remington 700
A Remington 700 is seen in the hands of another shark hunter posing with the shark. In a deleted scene, this person is seen holding the rifle as he fights with other hunters on the waters.
Ithaca 37 Field Gun
What appears to be an Ithaca 37 field gun is used by another shark hunter in a deleted scene.
Winchester Model 1892
Winchester Model 1892 rifles is seen in the hands of some shark hunters as well as some of Brody's deputies.
Winchester Model 61
Another shark hunter is seen with what appears to be a a Winchester Model 62 .22 LR pump action rifle