The M4 carbine is a dual perk assault rifle depicted in two fashions within Killing Floor; the first is a scoped variant listed as a commando weapon, the second featuring no scope and a M203 grenade launcher is listed as a demolition perk weapon. Both function the same for the commando perk, save for the bonus damage, scope, total ammo reserve, and grenade launcher, who also receives discounts on the cheaper scoped variant. The demolitions perk gets discounts on the more expensive M203 variant, and receives damage bonuses on the launched grenades, which essentially functions identically to the M79 grenade launcher for virtually all respects. Both weapons have separate ammo pools, and are interchangeable for the Bloody Yanks achievement.
The M4 is the commando specific variant of the weapon. It comes with a larger ammo pool, and an Aimpoint sight. It is functionally similar to the AK-47 but with better accuracy, less damage, and more total ammunition. It also has the ability to toggle fire from semi to fully-automatic fire, as with all other commando weapons. The demolitions perk receives no bonuses at all for using this weapon unlike a commando wielding the M4 203.
 M4 203
The M4 203 is the demolition specific variant of the weapon. It has a lower ammo pool than the commando variant, costs more, and loses the ability to toggle fire mode to semi automatic due to the under-slung M203 grenade launcher it features. It also lacks the Aimpoint sight the other variant features that the trader image erroneously depicts atop, instead featuring basic iron-sights. When used by a commando the damage bonus applied to the normal M4 does not apply to the M4 203, however, it does feature less recoil and larger magazines. A high level commando will have fewer total magazines than a lower level or a Demolitions due to more bullets being available in each magazine.
The commando and demolition perks both get bonuses and discounts for variants of the M4. The Bullet damage and Magazine size columns apply to the commando, the Grenade damage, Price and Sale value columns apply to the demolition perk.
|Level||Discount||Price||Sale value||Bullet damage||Grenade damage||Magazine size|
 Price and ammunition
The standard variant of M4 costs the same as the AK-47; £1000 with discounts for commandos of £100 per level down to a current minimum of £300. Conversely the M4 203 is one of the most expensive weapons in the game, with a base cost of £3500. Discounts are given to demolitions players of £350 per level to a current minimum of £1050. The ammunition costs £1 for three bullets, equating to £10 per magazine of thirty bullets. The M203 grenades cost £10 each; the same as the grenades in the M32 and M79, and can be stocked up to twelve.
At levels 3 and above with commando the magazine capacity is increased to 37 bullets. The total ammo reserve of the M4 increases with this accordingly to from 400 bullets to 500, however the ammo reserve size of M4 203 remains static.
The base damage for the M4's primary fire is 35 per shot; compared to 26 of the bullpup and 45 of the AK-47. However, it actually has the highest rate of fire of the assault rifles, so its active DPS is actually higher than that of the AK-47 and bullpup. The M203 grenade launcher on the demolition variant functions identically to the M79 grenade launcher, save for its smaller grenade stock.
The M4 has a notably high rate of fire, and is often frowned upon by most users of the weapon. However, one can notice that the recoil is greatly increased while moving. The best tactic while using the fully automatic fire mode is to stand stationary and crouch down to improve accuracy. This is not recommended when a scrake or fleshpound is advancing on the player, though!
 Advantages & Disadvantages
- An all-rounder weapon;
- Accurate, only when stationary;
- The view model does not noticeably sway about while using the sights, unlike the AK and SCAR;
- Reliably decapitates lesser specimens;
- High rate of fire;
- Semi-automatic and fully-automatic firing modes (for Commando M4 only);
- Underbarrel grenade launcher for added versatility and power (for M4 203 only).
- Weak against stronger specimens (like the Fleshpound or Patriarch), except for the M4 203's grenade launcher;
- High recoil in full-auto fire;
- M4 203 is expensive;
- No select-fire option on M4 203;
- Iron sights on M4 203 are not as effective as the scope on the regular M4.
- The 40mm grenade fired from the M203 is actually fired from the muzzle of the weapon, instead of the underslung grenade launcher. This can easily be seen by using the slow motion function or when fired during ZED mode.
- One can empty the magazine of the weapon, start the reload, and fire the M203 before the reload is finished, thus canceling out both reload animations.
- The pickup/trader icon for the M203 variant is incorrect. The in-game model does not have an M68 Red Dot Sight.
- If the M4 203 is bought before the M4, then both guns will share the lower, 300 rounds ammo pool of the M4 203. This can be fixed by dropping both weapons, then picking up the M4 first, followed by the M4 203.
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