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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 slow you down, at least slightly - while moving forwards you'll travel at full speed, but when strafing or reversing you'll move at 97.5 percent of your maximum speed.
Aiming down your sights also imposes a movement penalty - the degree of which depends on your weapon class.
SMGs, Machine Pistols, and Handguns will allow you to move at 0.8x base speed while aiming - this will stack with other penalties, so for example moving while aiming and crouching with an SMG will result in mobility a little over half your base movement speed.
Assault Rifles, LMGs, Shotguns, Snipers and Launchers will move more slowly whilst aimed - with a 0.4x multiplier.
Should you employ Stalker in your third perk slot, however - the penalty for aiming is completely removed, allowing travel at your normal rate while aiming down your sights - particularly useful with these slower weapons.

The LMGs, Sniper Rifles and Riot Shield all have a 'Speed' proficiency available, which will affect your movement speed with that weapon.
The proficiency acts as a straightforward 1.1x multiplier - so the LMGs, Riot Shield and slow Sniper Rifles will move at 88% of maximum speed, and the Fast Sniper rifles will move at 99% speed - almost as fast as an SMG or shotgun.
The speed bonus only applies to the weapon in question though, so you lose the 1.1x multiplier should you switch to your secondary, or replace your primary with another weapon.
When using the specialist strike package you will gain the speed proficiency when you reach 8 kills (or 7 with hardline).
This applies even to weapons that normally wouldn't have the option of increased movement speed - but does not apply to a weapon that already has the speed proficiency active.

Finally, the Juiced deathstreak will apply a temporary multiplier to your movement speed, granting 1.25x your base speed for 10 seconds.

Another major component of your mobility is sprinting - sprinting sacrifices your ability to fire your weapon for increased movement speed, allowing aggressive players to reach critical objectives first and to surprise slower opponents.
Sprinting will increase your movement speed by 50 percent - allowing you to cover more distance in a shorter timespan. However, your ability to sprint is limited by your stamina.
Your sprint endurance is around 4 seconds by default, permitting faster movement for that length of time only.
After expending this sprint endurance, you can walk normally - but won't be able to sprint again for a couple of seconds, and won't regain full endurance until some time after that.
You can increase your sprint duration with the use of Extreme Conditioning in your first perk slot - this will double your available sprint time to around 8 seconds, allowing for positional advantages and earlier intervention at objectives.

In this episode, we're taking a look at the G36 platform - namely, the G36C and MG36.

The G36, or 'Gewehr sechs-und-dreißig' hails from Germany - designed and manufactured by Heckler und Koch.
The G36 platform was designed in the early 1990s, entered production in 1996 - and in 1997, was adopted by the Bundeswehr.
The G36C made its first appearance in Call of Duty 4: Modern Warfare, and returned in Modern Warfare 3.
The C stands for Compact - as it's a subcarbine-length variant of the G36 rifle.
The MG36 is the Light Support Weapon variant, with a heavier barrel and bipod making it more suitable for sustained fire.
It made its debut appearance in Modern Warfare 3.

The G36 platform replaced the G3 rifle in service with the Bundeswehr, which was introduced in 1959.
The G3 was originally a Spanish design, namely the CETME rifle, named for the establishment who designed the weapon - the 'Centro de Estudios Técnicos de Materiales Especiales', or Centre for Technical Studies of Special Materials.
The CETME and later G3 rifles both fire 7.62mm NATO rounds - and as such are classified as battle rifles, in the same category as the FN FAL.
The 1970s saw a transition towards intermediate calibres, and so there was a growing desire to replace the G3.
The G11 was intended to be West Germany's new service rifle - a unique design using caseless 4.73mm ammunition.
Sadly, the project was scuppered during the political changes during the German reunification, and the G11 didn't see widespread adoption.
During this time, H&K offered a couple of rifles in the NATO intermediate calibre - the HK33, developed in the 1960s, was essentially a smaller version of the G3 rifle intended for export.
The G41 was a more modern version, introduced in 1981 - but neither this nor the HK33 were deemed suitable replacements for the G3, and instead were bound solely for export.

The newly united Germany had a desperate need for a new 5.56mm assault rifle, and in 1990 H&K would embark on 'Project 50' - what would eventually become the G36.
In trials, the G36 would face off against the Austrian AUG - but the native rifle won out, and was adopted in 1997.
The G36's magazine design is similar to that seen on the SIG 550 - translucent polymer box mags, with studs on either side, allowing magazines to be clipped together.
Standard capacity is 30-rounds, although for the MG36 there exist 100-round C-Mag type drum magazines.
Cyclic rate of fire is 750 rounds per minute across all variants.
The original G36 weighs in at 3.63 kilograms: The G36C is considerably lighter, at 2.82 kilograms; and the MG36's heavier barrel brings the platform to 3.83 kilograms.
Overall length, again, depends on variant: The original G36 and the MG36 are a shade shy of a metre, at 999 millimetres - while the G36C is considerably shorter, at 720 millimetres.
In addition to the rifle's adoption by the Bundeswehr, the rifle is used by many other forces all over the world - including the Hellenic Armed Forces, Latvian Army, Lithuanian Armed Forces, the Spanish Army and Navy, and the SAS - and many police forces, too - including the German Bundespolizei, Australian Operational Response Group, Brazilian Federal Police, Finnish Border Guard and Police, National Police of Iceland, Mexican Federal Police, UK's Metropolitan Police Service, and the United States Capitol Police.

The G36 platform extends to a number of variants - some intended for export, such as the G36V, or 'Variant', produced for Spain and Latvia.
The MG36 was the light support weapon variant of the platform, although this version is now discontinued.
The G36K - Kurz, meaning short - is a shortened carbine version of the rifle: somewhere in-between the G36 and G36C.

The more recent G36A2 is an updated version of the platform, equipped with a quick-detachable red dot sight on a Picatinny rail.
There exist a couple of civilian models, too - the SL8 semi-automatic rifle, and R8 straight-pull bolt-action.
Unlike the G36, these variants have a thumbhole stock, and some models will accept only single-stack 10-round capacity magazines.

H&K also have their eye on American military contracts - and the G36 platform has formed the basis of their proposals for infantry weapon systems.
The XM8 rifle is essentially a dressed-up G36 action, offered for the US Objective Individual Combat Weapon contract in 2003.
However, in 2005 the OICW contract was cancelled, with the XM8 project following suit.
The HK416 was a similar attempt to break the American market, this time competing for the Individual Carbine contract, seeking a replacement for the M4.
Competition is ongoing, and the HK416 remains in the contest - with the rifle's gas system derived directly from the G36, adapted for use on the AR-15 platform.