Fourth episode of 'Time To Kill', a series devoted to the inner workings and mechanics of Call of Duty's multiplayer. Episode four focuses on mobility - an essential part of traversing the battlefield, and part of establishing a positional advantage. Positioning is key in Modern Warfare 3 - whether aggressively rushing or playing with a more conservative approach, your location will do much to determine your success. In this episode, we're covering mobility. Your base movement speed is determined by the weapon you carry - heavier weapons will slow you down, whereas others will let you move unhindered. SMGs and Shotguns are the fastest weapons available - when using these you'll move at maximum speed, prior to any modifiers. Assault Rifles and some of the Sniper Rifles - the L118A, the MSR and Dragunov, grant intermediate mobility - at 0.9x movement speed, a 10 percent penalty when compared to the fastest weapons. The LMGs, Riot Shield, and remainder of the sniper rifle category - the Barrett, RSASS and AS50 - are the slowest weapons available, each decreasing your movement speed to 0.8x the maximum, a 20 percent penalty overall. Secondary weapons adopt the movement speed of your primary, so switching to a pistol while using an LMG will not grant a boost to your mobility, like it did in Black Ops. However, picking up two secondary weapons will grant you maximum mobility. If you're using the Overkill perk, your base movement speed will be that of the slowest weapon you carry - so an SMG paired with a Shotgun will retain 100% mobility, while carrying an LMG with a Riot Shield will not reduce your base movement speed below 80%. Your stance also affects your movement speed - standing up is the fastest means of getting about, with no penalty to your movement. Crouching will slow you down to 65% of your base movement speed, and going prone will reduce your speed further - to a mere 15% of your base speed, a snail's pace. Moving laterally will also sl