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The M4 is a standard issue carbine for the United States Army. It features a semi-automatic and 3-round burst firing mode. The M4A1 is the fully automatic variant of the M4 carbine, which in itself is a shortened version of the M16A2.


General information
Inventory slotPrimary
Weapon classCarbine
Fire modesSemi-automatic
OperatorsFac sec Security Forces
Drop start10 "110"
Drop shift450 "80"
Drop end10000 "46"
Max range ?10000
Rate of fire740
Reload time3.83s loaded
4.53s unloaded
General statistics
Penetration10 "600"
12000 "175"
Supply points ?3 Icon supply (Rifleman)
2 Icon supply (Demolitions)
Weight points ?130/640
Length ?18

The M4A1 is a select-fire carbine featured in Insurgency: Nightfall. It was introduced to the Security forces to balance out the AK-74 on the Insurgent faction. When compared to other AR-15 variants, the M4A1 has the same recoil patterns with the Mk18, but a slightly longer barrel. However, the M4A1 is able to mount a M203 grenade launcher, unlike the Mk18.

Attachments Edit


Early-Access VariantEdit

The M4 was one of the Security faction's carbines during "Insurgency - Early Access". Being able to fire in semi-automatic and automatic, it shared a similar role to the Mk18 . The appearance of the M4 was strikingly close to that of the M16A4 , featuring flip-up iron sights and a shortened barrel. Contrary to its given name in game, the M4 that was in the game was actually a M4A1

The M4 was eventually removed from the game, due to the role of the M4 being too similar to that of the Mk18, but it was brought back with the Insurgency: Nightfall update. However, with a different model this time. 

Trivia Edit

  • The fire selector is permanently set to the safe position on the weapon model, and does not change when switching fire mode, the fire selector simply rotates back to the safe position when switching fire modes.
  • The M4A1 and M16A4 share the same carry-handle model and texture.
  • When using red dot sights and holographic sights, the sight picture will be slightly misaligned to the left of the front sight post.
  • Since the M4A1 was not available until the Nightfall update, most people downloaded carry-handles to the Mk18 so it could be the M4A1.


Insurgency: Modern Infantry CombatEdit

M4A1 Vertical Grip
INSMC M4A1 Vertical Grip
General information
Inventory slotPrimary
Weapon classCarbine
Fire modesSemi-automatic
OperatorsUSMC-logo USMC
M4A1 Aimpoint
INSMC M4A1 Aimpoint
General information
Inventory slotPrimary
Weapon classCarbine
Fire modesSemi-automatic
OperatorsUSMC-logo USMC

In Insurgency: Modern Infantry Combat, two variants of the M4A1 carbine are available to the Sergeant class. The M4A1 Vertical Grip features a vertical grip that reduces weapon recoil, while the M4A1 Aimpoint features a reflex sight that provides the user with a clearer view through his sights. 

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