Bond's main sidearm throughout the film is a Walther PPK which he uses until he loses it in the freefall scene after his plane crashes. He is then seen using the PPK again to threaten Yusuf at the film's conclusion.
The Walther PPK was the weapon of choice for James Bond in almost all the Bond series.
"Walther PPK. 7.65 mm, with a delivery like a brick through a plate glass window. Takes a Brausch silencer with very little reduction in muzzle velocity. The American CIA swear by them."- Major Boothroyd to 007, Dr. No
