Charter Arms used to make a pistol version of the Armalite AR7. They are being made by Henry Repeating Arms as the U.S. Survival AR7. Unfortunately they are only made as rifles and not pistols like this one. It sort looks like the DL44 Blaster used by Han Solo.

With a little bit of dressing, I think you could make something look similar. A shame Henry doesn’t make the AR7 into a pistol.