Weapon wear should mean more jams and misfeeds as the internals are getting dirty, especially the M4/FN45, which need more looking after than a shotgun/double rifle/Revolver. So the status of weapons becoming more worn should be different for each type of weapon. At the moment you pick up a pristine (Clean and working) M4 put 5/6 magazines through it, roll around the floor a bit, you should be looking to clean it to keep it pristine. If not then its going to start to malfunction. M4 users try to keep their weapons as oiled as possible to stop these malfunctions, using a cleaning kit should be high on users post battle drills. Differing weapons and weapon systems all have their advantages and disadvantages, but they should all be looked after, most experianced users will be on top of their weapon cleaning, after all its the one thing you need to work every time. Looked after an M4 should on average manage 1 to 2000 rounds between faliures, a looked after UK L85A2 will on average manage 30k rounds between faliures. Its all down to the gas system of the weapon, The L85 has a 21" barrel, so will be accurate and have enough stopping power to injure at 300m, the M4 with its shorter 16" barrel, will be accurate to 200m and have the same injuring effect. The L85 is a lot heavier than the M4, so its swings and roundbouts, Hopefully this difference between similar weapons firing the same ammunition will be included in the finished game.