Both James Bond (Sean Connery) and Count Lippe (Guy Doleman) carry the Walther PPK with and without a suppressor. Vargas (Philip Locke) can briefly be seen with one as he silently approaches Bond and Domino. Bond's dropped PPK has the "bull-dog" nose of a pre-WWII pistol rather than the sleeker lines of the post-war PPKs.
Beretta M1934
When Count Lippe (Guy Doleman) prepares to face Bond at Shrublands, he affixes a suppressor to a compact Beretta M1934.
Colt Detective Special
Count Lippe fires a Colt Detective Special at Bond while chasing him on the road from Shrublands. The Disco Valante captain draws one on Bond during the finale, which Largo (Adolfo Celi) later picks up and holds briefly.
Beretta M1951
One of Largo's thugs gets his Beretta M1951 knocked out of his hands, which Leiter unloads.
Unidentified Sniper Rifle
Felix Leiter (Rik Van Nutter) fires a rifle with a scope at a shark to distract the other sharks as Bond dives.
The upper handguard on the rifle gives it away as a M1 Carbine variant. It may be one of the Iver Johnson M1 carbines that had a pistol grip stock.
There is another possiblity,the French Unique .22 Model L pistol/carbine combo,which featured a pistol that fitted up into the "M1 carbine"-like stock, which got around ATF regs due to the fact the carbine setup had an 18 inch barrel. Leiter is holding the carbine the way one would hold this model.
Regards,
Tecolote
Remington 1100
Both Largo (Adolfo Celi) and Fiona (Luciana Paluzzi) fire sporting Remington 1100s with raised ribbed when target shooting. Bond claims to Largo that the shotgun would look better in the hands of a woman.