Dragunov
Semi automatic long range sniper rifle.
Unlocked at rank 34.
The Dragunov is a soviet rifle that not only has a large following in COD4 but is also the only gold sniper that you can get in COD4. This is unlocked by completing all of the challenges for each sniper rifle, getting red tiger on each.
In practice the Dragunov is very accurate and quite quick to aim, allowing reasonably easy headshots. This is needed as it does not have the power to take down targets as easily as some other rifles. Juggernauts can be a real pain unless you aim for that head shot. The Dragunov also has quite a kick, not massive but enough to make multiple shots tricky. It is quite predictable though and a second shot is possible with practice.
It does not have particularly good penetration and it is worth waiting for a clear headshot than attemting to shoot through cover. For this reason iron lungs would be a good choice for this rifle to allow more presice aiming.