According to multiple sources, the best sniper rifle in Modern Warfare 2 varies depending on personal preference and playstyle. However, there are some rifles that are consistently ranked highly across different sources. Here are some of the top-ranked sniper rifles in Modern Warfare 2:

• FJX Imperium: This sniper rifle is often ranked as the best in the game due to its high damage and fast handling.
• SP-X 80: This sniper rifle is known for its excellent one-shot kill zones, fast handling, and good rate of fire.
• Signal 50: This sniper rifle has a fast fire rate and minimal recoil, making it easy to land multiple shots on an opponent.
• MCPR-300: This is the first sniper rifle that players unlock in Modern Warfare 2, and while it is slower than some of the other rifles on this list, it has high damage and good handling.
• Carrack .300: This semi-automatic sniper rifle is a recent addition to the game and is known for its high damage and rapid bullet velocity.

Ultimately, the best sniper rifle in Modern Warfare 2 depends on the players individual preferences and playstyle.