M4A1-S

Counter-Strike: Source M4A1-S details: Costs $3100, has 20/40 ammo, and features a removable suppressor.

Cost: $3100

Ammo: 20/40

Kill Award: $300

Damage: 33

Fire Modes: Automatic (600 RPM)

Accurate Range: 39 m

Movement: 225

Armor Pen: 62.5%

Penetration Power: x2

Reload Speed: 3.1 s

Shortcut: B-4-2

Shares Slot With: M4A4

Special: Remove/attach suppressor

This suppressed version of the M4 is identical to its louder counterpart with a few key distinctions. The most notable is its ammo pool, which is effectively half the M4A4's, placing an emphasis on shot accuracy. The M4A1-S also boasts a lower damage falloff from distance, and of course, there's the suppressor, keeping your shots silent and your presence hidden. Notice, however, the slower rate of fire and smaller armor pen ratio, which means the A1 will have a lower DPS output as compared to the A4.

Note: Just like the USP-S, you have little incentive to take off the suppressor, because at that point you practically have an M4A4 with half the ammo gone and a smaller mag.