The three versions of the original Buck Rogers ray gun

https://www.collectorsweekly.com/stories/178697-buck-rogers-ray-guns-1930s

There were 3 issues of this ray gun; the first in 1934 is at the bottom and is like the one used in the movie serials. The handle cocks the gun and it makes a 'pop.' The copper plated one is 1935 and is called the Disintegrator; pull the trigger and it pops and the window flashes like a cigarette lighter. The gold painted one is after the war, 1945 and is called the Atomic Pistol.