Name this handgun.?

Question

It was in Taxi Driver. The guy selling it said it was a Colt 25, but it isn't because the recoil guide is above the barrel somehow.

Answer 1

"The 'Colt .25' that Travis Bickle purchases from the black market arms dealer is, in fact, a Smith & Wesson Escort .22LR."

Answer 2

Go to a public library or to a good large book store and look for books on guns. You will find large books with pictures and descriptions with prices of most firearms.