I'm looking for a fun little gameplay mod I played years ago. The core concept was the collection of different boxes of color (red, blue, green, yellow, maybe even more). Each one of them represented a specific attribute like pure damage, rate of fire and so on. They were basically weapon upgrade kits and offered a huge variety of possible combinations for each vanilla gun.
I think someone somewhere called it the "Brutal Doom of smart people", but I really don't want to talk any trash about BD!

I also remember that each vanilla gun had a short, fun description - the six shooter's had something to do with dueling with the demons at high noon...
Thank you in advance!