The SG 550 is a powerful semi-automatic sniper rifle available only to the Counter-Terrorists. Along with the G3SG/1, it is known as being one of the most imbalanced weapons in the game despite its disadvantages. For this reason, the SG 550 is banned on many public servers rendering it useless. Because of this, the AWP is often chosen over the SG-550 and the G3/SG-1 due to high damage per shot and has better accuracy.
The SG 550 is a heavyweight weapon. While wielded, the player's movement speed is 210 units per second (default speed is 250), meaning they suffer heavy speed reduction. While zoomed in, their movement speed is 150 units per second. The SG 550 is one of the many weapons able to shoot underwater.
Unlike the G3SG1, you should spray instead of firing in burst; the recoil won't increase if fired constantly.
At medium and long range, crouch and activate the 2x scope. Aim for the stomach and start firing non-stop. Two to three shots will kill the enemy.
If an enemy does not notice you and he is stationary, take time to shoot his head for a guaranteed kill.
Switch to your sidearm if an enemy player is too close or use the either non-scope or 2x scope and keep firing.
Due to the high damage, a Desert Eagle is a good backup weapon for engaging enemies at close range.
The SIG-550's accuracy is worse compared to the Scout, AWP and G3SG/1, so be sure attack an unaware enemy if he is armed with the AWP or the G3SG/1. If this is not considered, enemies with an allied sniper can easily counter your tactics.
In Source version, the SIG-550's accuracy is increased, thus can be used more effectively than in older games.
Unlike the AWP or Scout, if the enemy uses a smoke grenade, you can fire randomly through the smoke and still have a good chance to get a kill.
Zoom in and mark the central red-dot (Counter-Strike 1.6 and Condition Zero) / center (Source) of the crosshairs with a wipeable sketch or marker pen of the color of the crosshair. This way the SG550 can be used unscoped as an semi auto battle rifle. This also works with the G3SG/1 and Scout.
Despite using a smaller caliber, SG 550 has similar effectiveness of the G3SG/1 in Source version, due to the increased accuracy and tighter group of impact. So far, this is the most powerful 5.56 weapon in the series.
The database file name for this weapon is sg550.
As with the G3SG/1, many servers restrict and/or ban this weapon due to its high power. These servers typically have the tag [No Auto] in their name.
The SG 550 is CT's only Sniper rifle available in assassination maps, its CT's best answer to enemy AWP users.
The suffix Commando in its name is a misnomer as the term denotes the smallest possible derivative of a full sized assault rifle with a shortened barrel, used for close quarter engagements by special forces. Eg SIG SG 552 Commando for the SIG SG 552 and Colt Commando to the Colt M16. The term SIG SG 550 Marksman/Sharpshooter is most appropriate.
Because it is less accurate compared to other sniper rifles, higher level bots that use the SG 550 will usually fire in short bursts which may sometimes struggle to kill enemies at almost any range. However, if difficulty is set to easy, bots will always spray bullets and they can use it effectively. In Counter-Strike" Source, however, bots can achieve multi-kills with the SG 550 regardless of difficulty.
In early games, CT bots will pick up G3SG/1 to replace their SG 550.
The Krieg 550 fires unrealisticly slow; it should fire at 700 RPM. Therefore, it should fire as fast as the Krieg 552, used by the Terrorist.