While working on Watchdogs Legion, we had to make a lot of weapons in a few time with my teammate Louis-Michel Lebeau.
Setting up everything, we had around 5 to 7 days to make a weapon from high poly to the last LOD in game.
We had to keep a "low" polycount since it was a 3rd person game and I like to think we did well :)
Here is the Colt, around 5k triangles, made in 3 days. During the production, the scope was removed but I like this strange look :) Remind me of the one from Resident Evil 4