|Alternate name(s)||Colt M4A1 Carbine|
|Magazine capacity||20 / 40|
|Rate of fire||600 RPM|
|Reload time||3.1 s|
| Movement speed|
(units per second)
|225 / 250 (90%)|
|Kill Award|| $300 (Competitive)|
|Recoil Control||19 / 26 (73%)|
|Accurate Range||28 m|
“With a smaller magazine than its unmuffled counterpart, the silenced M4A1 provides quieter shots with less recoil and better accuracy.”
- For the M4A1 before Counter-Strike: Global Offensive, see Maverick M4A1 Carbine.
The M4A1-S is a Counter-Terrorist exclusive rifle in Counter-Strike: Global Offensive and was added in the game on the August 14, 2013 Arms Deal update. It is a variant of the M4A4 assault rifle, replacing it if equipped in the loadout. It is a successor of the M4A1 from previous Counter-Strike games.
The M4A1-S in game is a Colt RO 777, an early model of the M4A1 with fixed handle. 
In game, the rifle has 20 rounds per magazine and 40 rounds in its reserve. A new feature implemented is that the silencer now takes more time to attach and detach and it is already attached once the player purchases it. Otherwise, it works identically to the M4A1 found in previous games.
|Chest & Arm||32||23|
|Abdomen & Pelvis||41||28|
- Quiet firing sound
- Low recoil
- No tracers if the silencer is attached
- Very accurate and relatively low spread, especially when suppressed.
- Low magazine size
- Low number of reserve magazines
- The silencer extends the weapon's length, exposing hiding users
- Lower rate of fire than most assault rifles
- If you can spare ammo and/or cannot evade more than two assailants, spray bullets at close to medium ranges.
- Almost always keep the silencer on. Removing it provides almost no advantages as it increases the recoil and spread, decreases accuracy while jumping, giving away your location more easily with un-suppressed shots, and is less effective than the M4A4. Firing with the silencer may not always prevent attention from alerted foes, but they will have a harder time in pinpointing your location if your position is concealed. The silencer however, will increase the length of the gun so it may be removed in order to shorten the gun and hold a position easier (e.g beside the vents in Bombsite A in Nuke). It can also be removed to make your decoy grenade louder.
- Hit and run is a good way to maintain stealth. A player can be more effective and maintain stealth when flanking or attacking from the rear.
- If you do not want to use the silencer for whatever reason, it's recommended to work with other teammates. A lone, unsuppressed M4A1-S user will be at a major disadvantage when engaging most enemies.
- The magazine capacity and ammo reserve are the lowest of all the other automatic rifles. Counteract this by limiting pre-fire and implementing controlled, sure shots.
- You can combine the M4A1-S and USP-S to make you even more subtle, but beware of their very low ammo capacity.
- Since users are very unlikely to remove the silencer, be sure to have another team member with you. A M4A1-S user can easily hide and attack enemies, especially in some open-spaced areas if the suppressor is attached.
- Nearly any other rifle is recommended to engage enemies with this silenced rifle. The AK-47 is an excellent weapon as it inflicts higher damage without sacrificing a high(er) magazine size (although it does have high recoil per shot).
- The P90 is a good SMG to wield, due to its 50-round magazine. Because the M4A1-S lacks high ammunition capacity, users are unlikely to spray bullets even at close proximity. If low on money, the PP-Bizon is another high-capacity SMG that can be used to spray bullets at close range, though because it has low damage per shot and high damage fall-off, it is only effective at close quarters.
Comparison to the M4A4
- Silencer is available
- More accurate when moving
- No tracers if the silencer is attached
- Less damage fall-off at distance
- Better recoil control (19 vs 20)
- Same reload time (3.0 seconds)
- Same penetration power (200)
- Same kill award ($300 (Competitive) $150 (Casual))
- Same movement speed (225)
- Same accurate range (28 m)
- Same price ($3100)
- Same armor penetration (70%)
- Smaller magazine and less reserve ammo (20 / 40 vs 30 / 90)
- Greater length with a silencer attached
- Slower rate of fire (600 RPM vs 666 RPM)
- The "S" in M4A1-S designates "silencer" or "suppressed".
- The M4A1-S shares its reload animations with the M4A4 and SCAR-20.
- All three involve "slapping" the side of the gun. This is actually slamming down the bolt catch (a small, paddle-shaped lever on the side of the receiver). Although meant pressed with the thumb, some shooters prefer slapping it for convenience.
- Some gun experts refer to this process as "sending the bolt home".
- This weapon is the reintroduction of the original Maverick M4A1 Carbine from earlier Counter-Strike games, (originally replaced by the M4A4 in Global Offensive), with a few changes:
- Removing the silencer takes longer.
- The magazine capacity and reserve ammo capacity is smaller.
- Unlike the original M4A1, the silencer is pre-attached to the rifle.
- The M4A1-S has unusable firing mode selectors.
- The model shown is set on SAFE. In reality, this would render the weapon unusable since the trigger cannot be pulled.
- The magazine model of the M4A1-S depicts a curved 30-round 5.56x45 STANAG magazine (also used on M4A4), despite still having a 20-round capacity.
- Statistically, the M4A1-S is more popular than the M4A4 despite the magazine reduction, arguably due to its silencer and more controllable recoil.
- The noise-reducing effect of the silencer is somewhat exaggerated. Though in-game shots are depicted as audible but quiet "pew-pew" noises, in reality a silenced gun would still produce 130-145 decibels of noise, which is still as loud as a jackhammer.
- M4A1 at Wikipedia.