The Stridsvagn 81 (Robot 52) was an Strv 81 that was armed with the Robot 52 anti-tank guided missile (ATGM). This missile is essentially a Swedish copy of Nord Aviation's SS.11 manual command to line of sight (MCLOS) wire-guided ATGM. Shortly after the introduction of the Strv 81 in the 1950s, the Swedish Army tested the possibility to install anti tank missiles in Centurions and other platforms. During this time period, it should be considered that many armies envisioned ATGMs as the future of armored warfare, since they outranged most if not all cannons. Tests were carried out with a Centurion Mk.3 fitted with SS.11 ATGMs produced in Sweden by the name RB 52, but instead the army decided to use this missiles in proper ATGM carriers and scrapped the project.

Introduced during Update "Raining Fire" in the 8th Anniversary Sale as a substitute for the 81 (RB 52)(uk_centurion_mk_3_ss11) formerly present in the British ground forces tree prior to the introduction of the Swedish ground forces, the Strv 81 (RB 52) represents a Swedish-camouflaged Centurion Mk 3 fitted with RB 52 ATGMs. Its gameplay is very similar to that of modern main battle tanks. Players never have to worry about opponents appearing around corners and stopping to take aim with the two-plane fully automatic stabilization system. The availability of RB 52 ATGMs is one distinctive secondary armament that the vehicle has over the standard Strv 81. The RB 52 missiles mounted on the right side of the turret provide up to 600 mm of armour penetration. Three are immediately available for use and are directed by an MCLOS system. The missile's trajectory is such that it rises for a short distance before levelling down, producing a "dead zone" of up to 200 metres that the missile cannot fully engage in. Players who launch missiles must be constantly conscious of the distance between themselves and the enemy.