Well, Mr. Serious, then please post some actual information instead of making this topic look like yet another "eX-pluhzionz lulz1!1" suggestion. Range? Damage? Skill? Perk? Crafting/Way to get? Price? AP cost? etc.
Very well Sir Questioner...
Crafting? It's a weapon made out of junk, my recomendation would be BG 1 profession, metal parts, junk, flamer and a rocket launcher (we need a "pipe" so the junk can come out of the gun).
Range? About the same as a newbie pistol.
Damage? 10-20 with common junk and 15-35 with rarer resources like refined iron ore, something interesting would be bottle caps causing 5-10 damage but having high critical chance.
Perks? The same perks that affect ranged weapons.
AP cost: 5 ap per shot and 6 for aimed shot, reload must be done via inventory.
Load gun? Use the backpack icon on the launcher and then select the junk you want to load it in, I don't understand the game mechanics well enough to say that this is more than a mere suggestion.
Price: Who gives a shit? Merchants never have caps anyway.