"A high quality assault rifle"
The Scar is a fully automatic gun, with a good fire rate and a good range at the price of 200,000. It is best for assaulting head-on. But in that case, it has the same stats as the AK but the AK shoots even faster and lower that the gun bullet drop than SCAR.
It is best for a close ranged assault, or medium range, not so much a distant assault. It is very expensive, so unless you use the default for months saving up, you will gain experience, and know exactly how to use this gun. It is heavy-ish, so you will be slightly trudging along, as you spray bullets around the battlefield.