In Call of Duty 4: Modern Warfare's multiplayer, the R700 is the fourth sniper rifle to be unlocked. It is much like the M40A3, except it only holds four rounds, has more reliable damage multipliers, and has greater recoil and sway. However, with Stopping Power they both deal equal damage in most situations, making the M40A3 far superior if planning to use Stopping Power as a perk, and when not using Stopping Power, it has the same damage as the Barrett .50cal and Dragunov. The Dragunov being semi-automatic, having 10 round capacity and the least recoil of the three sniper rifles, (unless taking out players using Juggernaut, in which case the R700 is capable of killing them in one hit if shot in the chest or up, and the M40A3 can only kill with a neck or head shot). Being a low capacity bolt action rifle, the R700's greatest asset is its sheer stopping power. In Single player, this weapon can only be used in the level The Sins of the Father as a starting weapon. If planning to keep the R700 on The Sins of the Father, be sure to use Infinite Ammo, as it comes with little ammo.
The R700's sway is set to 6 degrees whereas all other sniper rifles are set to 4 degrees; meaning that the R700 will move more if breath isn't held, and it takes longer to steady while a player is holding their breath.
In the Single-Player, the R700 appears to be the Sniper-Rifle of choice for SAS Operatives, as in Heat, Mac is heard providing Sniper-Support with what sounds to be a R700, and in The Sins of the Father, the next mission, "Soap" starts with this weapon.
- The R700 is the only weapon in the game that applies camouflage to the scope (except ACOG) as well as the gun itself. This unique look and the fact that most camouflage patterns are more vivid on the weapon has made this weapon somewhat popular among players.
- The hit detection problems that plagued the R700 (before the patch) aren't present on the Wii version of Call of Duty 4: Modern Warfare.