The RSASS appears in "Eye of the Storm", with a variation of a Hybrid Sight and Silencer. It is the only sniper rifle that has the Hybrid Sight attached, though this is applicable to single player only. However, this is not the same hybrid sight used by assault rifles; instead, it is simply the normal sniper scope that the rifle usually has, accompanied by a red dot sight mounted on the gun at an angle. It is also seen unsilenced and without the Hybrid Sight attachment later in the level. The RSASS is also the starting weapon in "Blood Brothers" which Yuri and Soap use to help Price. It can also be found and used in the mission "Stronghold".
The RSASS is a sniper rifle unlocked at level 44 in Multiplayer. It has the highest magazine capacity and lowest recoil among sniper rifles, making it the most user friendly weapon in this category. This, however, comes at the cost of having the lowest damage, although this shouldn't be too problematic since the two hit kill requirement is relatively easy to achieve, since consecutive shots are more manageable with this weapon. Playing Hardcore game types will also mitigate the damage, and make the RSASS one of the best sniper rifles due to its rate of fire and magazine size.
One other minor disadvantage is that when spawning with the RSASS, the player receives only one spare magazine instead of the default two. However, due to the RSASS's large magazine size, one still spawns with more ammo than with any other sniper rifle.
The Silencer is a great attachment choice, for the RSASS still takes two shots to kill; this set-up works well with Assassin Pro. The Variable Scope is also good, as it adds versatility to the weapon, allowing to hit targets easily at any range. The ACOG Scope, on the other hand, is useful if one wants to use the RSASS up close. Extended Mags has varying degrees of use depending on the player; it can be used just to have more starting ammunition; it can used if the person has a very fast trigger finger; or it can be used if the player needs to eliminate large groups of enemies in short spaces of time where reloading in between would not be possible. The Variable Scope is of questionable value to the RSASS. Its higher zoom setting can turn the RSASS into a deadly long-range marksman rifle while its lower zoom setting can be used in a pinch against players armed with close quarter oriented weaponry. However, it may also be considered a waste of an attachment for those seeking a stealth set-up or a close quarters based rifle. Scavenger is also quite helpful because even a good marksman will usually use 2-4 shots per target, so ammunition is chewed through surprisingly quickly. Pairing it with Extended Mags makes the RSASS very useful for players who have a very fast trigger finger, as running out of ammunition is never a problem with either 100 or 150 total rounds.
The RSASS has key advantages over the Dragunov which includes a larger magazine size, faster reload time, and more starting and maximum ammunition. However, the Dragunov is unlocked earlier than the RSASS, and has the mobility of an Assault Rifle while the RSASS has the mobility of an LMG. In addition, the Dragunov was buffed, allowing the Dragunov to have a lower recoil pattern than the RSASS. This patch was released for Xbox and PlayStation.
The RSASS can be also be rivaled by the MK14. The MK14 has a higher damage than the RSASS in CQC. This can make it more advisable to use over the RSASS with ACOG because the MK14 also has a smaller hipfire spread. However, this is negligible due to the RSASS's higher rate of fire. The RSASS is also unlocked slightly earlier and has a higher damage at farther ranges.
The RSASS is available for both Survival and Mission modes.
The RSASS is found as the starting weapon in the Mission Mode challenge Resistance Movement. It has a silencer and a Thermal Scope, but without the thermal capabilities. It is also found as an alternative weapon in the initial area of Fatal Extraction. Ozone also uses it with a Silencer and a Thermal Scope in Kill Switch.
The RSASS is available in Survival Mode at level 29 and costs $2000. The RSASS is not good past the medium troops, due to its inability to kill in two shots at that point, although the player can attach an ACOG Scope on it, and when paired with Quickdraw, it can be used as a decent weapon for medium range use, because of its high damage, and high capped rate of fire.
- ACOG Scope — Unlocked at weapon level 2.
- Silencer — Unlocked at weapon level 5.
- Heartbeat Sensor — Unlocked at weapon level 13.
- Extended Mags — Unlocked at weapon level 15.
- Thermal Scope — Unlocked at weapon level 19.
- Variable Zoom — Unlocked at weapon level 22.
- Hybrid Sight (Campaign only).
- Kick — Unlocked at weapon level 4.
- Impact — Unlocked at weapon level 10.
- Attachments — Unlocked at weapon level 14.
- Focus — Unlocked at weapon level 18.
- Speed — Unlocked at weapon level 24.
- Stability — Unlocked at weapon level 28.
- The RSASS has the Remington logo engraved on the left side of the gun, similar to the ACR 6.8 and the MSR.
- The RSASS has a folded bipod, and the selector switch is always on safe.
- When prone with the Heartbeat Sensor attached, only the top half of the sensor is visible.
- In Resistance Movement, the RSASS uses the thermal scope reticle, but does not have thermal capabilities, similar to a thermal sight in multiplayer when an EMP is active.
- In "Eye of the Storm", picking up the RSASS found just after destroying the BTR, the total remaining RSASS ammunition will decrease. Swapping back to the dropped weapon, then picking up the RSASS again, will decrease the remaining ammunition further, until eventually there is no ammo left.
- In "Blood Brothers", Yuri starts out the assassination with a regular RSASS. However, when he looks up from his rifle before the explosion, the RSASS is equipped with the Hybrid Sight and a silencer.
- In Yuri's flashback, it is possible to see a Silenced RSASS leaning on an ammo crate.