The SCAR in Crysis has 0% to do with the real-life Scar-H. It's not "Special operations force Compat Assault Rifle". It's Mk.20 Superior Combat Assault Rifle. And the SCARAB is the Mk.21 Superior Combat Assault Carbine. They are both fictional weapons in a fictional universe playing in the future. I took the names from the Xbox Pre-Alpha version (means it's official). I still can't get why people think it really has to be a real weapon. It surely has some sort of design, looking like the XM8, but it's not one. Deal with it!

So now BTT: The SCARAB is a good Mid-Ranged weapon, when you know how to controll a gun. I once used it, bursting away an enemy on the other side of the map. Still, combined with a (working) Laser Sight + Silencer, and you are the deadliest stealth-killer around. Unfortunately, the Laser Sight is currently buggy and useless, so it should be combined with Reflex Sight. It IS a good weapon. You just need to have good aiming.