Something i think about is how the concept art of the game admits the pipe guns aren't meant to look like real guns, just "gun shaped". The devs did it intently :
Level Action Sharps Pipe Rifle Model image - Fallout: Liberty Hell mod for Fallout 4 - Mod DB
Pipe rifle (Fallout Shelter) | Fallout Wiki | Fandom
Why Pipe Pistols and Rifles are Good Guns and Weapons in Fallout 4 (Pipe Weapons Worth It?) - YouTube
Pin on Gamer <3
Pipe RIfle | Fallout 4 Wiki
Enchanced pipe rifle with silencer and scope image - Fallout mod for Mount & Blade - Mod DB
Pipe gun (Fallout 76) | Fallout Wiki | Fandom
Pipe rifle | Fallout Wiki | Fandom
WIP) Bolt Action Fallout 4 pipe rifle inspired blaster built on commision : r/Nerf
Pipe gun (Fallout 4) | Fallout Wiki | Fandom
Instant Digital Download Fallout Pipe Rifle Foam Pattern - Etsy
Fallout 4: Is This the Most Useful Weapon in the Game?
Pipe rifle Fallout 4 - Download Free 3D model by olofunot (@olofunot) [1139cc9]
Fallout 4-Inspired Pipe Rifle at Fallout New Vegas - mods and community