In the 1976 film 'Taxi Driver', how many guns did Travis buy from the salesman?

In the 1976 film "Taxi Driver," Travis Bickle, portrayed by Robert De Niro, buys four guns from the salesman. During the movie, Travis becomes disillusioned with society and feels compelled to take matters into his own hands. In an attempt to arm himself, he purchases two .25 caliber pistols, a .38 caliber revolver, and a .44 Magnum revolver, demonstrating his increasing obsession with violence and his growing detachment from reality. These gun purchases symbolize Travis' descent into madness and his ultimate transformation into a vigilante character.