This is a list of all of the Sniper Rifles in the Multiplayer Version of COD4. This will show you when guns are unlocked, and how each gun fairs against each other:- Accuracy / Damage etc.

Stock Item

The M21 is Unlocked at Corporal (Lv7)

The Druganov is Unlocked at Master Guunery Sergeant (Lv22)

The R700 is Unlocked at Major (Lv34)

The Barrett .50cal is Unlocked at Lieutenant General (Lv49)