Why does it look like a double barrel shotgun but merged we are pistol making it a double barrel pistol

This is my type of gun I like to make

Look at what I gets

Happy birthday, Rick May...

Teenage Mutant Ninja Turtles and turtles power

Rd D2 as a Mech

This is the reason why... i got to go breakout Goofy

I give up

Why do these exist? The cool and all... but why do they exist