"Replica" could be something as simple as a spray-painted cap gun...
Hell, when I was young (oh, that sounds old) I could go to Woolworth's (oh, I'm really old) and buy a pair of black (suction dart) guns for $10; not to mention the very real looking battery operated water pistols, like the "Rambo" line that included an AK-47 and RPG.
Good Lord, I'm almost 40.