Weapon m4a1

Class hierarchy
CWeaponM4A1 ↳CWeaponCSBaseGun ↳CWeaponCSBase ↳CBaseCombatWeapon ↳CBaseAnimating ↳CBaseEntity
weapon_m4a1.cpp

Maverick M4A1 Carbine in CS:S.

M4A4 in CS:GO.

weapon_m4a1 is a model entity available in Counter-Strike: Source, Counter-Strike: Global Offensive, and Counter-Strike 2.

Risk of Confusion: This entity is the M4A4. Its alternative is the M4A1-S, weapon_m4a1_silencer.

Entity Description

The  M4A1 Carbine is a Counter-Terrorist exclusive rifle that uses ammo_556mm ammunition. It holds 30 rounds in magazine and 90 in reserve.

KeyValues

CS:S / CS:GO Weapon:

Ammo (ammo) <integer> (only in )

Amount of reserve ammo to be added. Fallback value is 0. !FGD

Is this weapon allowed to be picked up? (CanBePickedUp) <boolean> (only in )

Determines if players are able to pick up the weapon.

Flags

Start Constrained : [1]

Prevents the model from moving.

Deny Player Pickup : [2] !FGD

Prevents player from being able to pick up the weapon.

Inputs

CS:GO Weapon:

SetAmmoAmount <integerRedirectInput/integer> (only in )

For guns, sets the number of bullets in the active magazine. Does nothing for grenades.
Every value behaves like its congruent value in the range 0-255 in modulus 256 (e.g. -255 and 257 behave like 1 etc.). When set to 0, the owner may start reloading automatically, if possible. Other values congruent to 0 (-256, 256, 512, ...) might cause undefined behavior. Values congruent to -1 (mod 256) make the ammo numbers disappear. If set to a value outside the weapon's clip size, reloading might deliver unexpected results.

SetReserveAmmoAmount <integerRedirectInput/integer> (only in )

For guns, sets the number of bullets in reserve for reloading, clamping at the weapon's maximum (e.g. 90 for the weapon_ak47).
For grenades, sets their count, clamping at the current maximum depending on the convars ammo_grenade_limit_*; When setting to 0 or below while holding the grenade, the player no longer owns any, but the viewmodel stays.
Negative values make a gun's ammo display disappear and reloading is impossible.

ToggleCanBePickedUp <booleanRedirectInput/boolean> (only in )

Toggles whether the weapon can be picked up by players. Visually, nothing changes and there is no event if picking up fails. Hover texts like "[E] Swap for AK-47" remain in both cases.

Outputs

CS:S / CS:GO Weapon:

OnPlayerUse

Fires when a player +uses this weapon (!activator is the player.). Does not fire if the weapon is picked up successfully.

OnPlayerPickup

Fires when a player picks this weapon up (!activator is the player.).

OnCacheInteraction  !FGD

When dropped, fires every tick on player touch (!activator is the player.).
Also fires on successful +use pickup. Does not fire if CanBePickedUp is false.

OnNPCPickup  !FGD

Fires when an NPC picks up this weapon (!activator is the NPC). Bots are considered players, so this output has no functionality.
Hostages might be NPCs, but they don't pick weapons up.