While messing around with the game, I discovered a lot of items that exist in the game engine, but were dropped out of the actual game. For example, every rifle that I wield looks exactly like the Levered Machinegun (that's the name, if I'm not mistaken).

Just look at the Marksman Rifle, you can see clearly that the old design doesn't fit with the design of the Looking Glass Rifle.
I was too lazy to actually search for it. It's up to this couple of people that still read this forum to try to answer this question for me. Thanks, in advane.