

why do guns need rails to look like rails?
so basically im working on a cold war/the forever winter/ghost in a shell inspired worldbuilding project
and my mai problme is
looking that im making a sci fi apocalyptic world with guns that look both sci fi,realistic and mainly look like cold war guns
my main problem is the design with rails
cuz if i put rails on my design of my guns they look just like a modern gun
but if i put just a rectangular shape it looks weird
what reason could i give to rails looking like rectangles of plastic to fit the cold war vibe im going for?