The SCAR-20 is a semi-automatic sniper rifle that trades a high rate of fire and powerful long-distance damage for sluggish movement speed and big price tag.
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The SCAR-20 is identical to the Terrorist's alternative, the G3SG1, in every aspect except that the SCAR reloads faster.
See it in action!
The SCAR (often just called the auto-sniper) is an amazing (but expensive) defensive weapon, able to hold down rushes and take on multiple enemies at once. While it is certainly disadvantaged against AWPs, it can still hold its own if you have superior timing or positioning!