The G.91 R/4 (Germany) is a premium German jet fighter. It was introduced in Update "Starfighters" as a premium purchasable in-game for Golden Eagles. It was later added to the store as a premium pack in Update "Ixwa Strike" until it was removed after the 9th Anniversary Sale, but was later re-introduced as a regular in-game premium for.

The R/4 is a variant of the G.91 jet fighter that has been modified for ground attack, allowing it access to a competitive selection of air-to-ground ordnance such as bombs, rockets, and high-explosive air-to-ground missiles. The R/4 also has the option to equip two different types of air-to-air missiles; the IR-tracking AIM-9B Sidewinder missile, or the command-guided AA-20 Nord missile.

The G.91 R/4 is a very nimble fighter with relatively average top speed and fairly good acceleration. Best played as a support fighter, the G.91 R/4 can use its incredible roll and turn rates to quickly get guns on target, as well as to dodge the typically less manoeuvrable fighters that it shares its battle ratings with.

The main difference between the R/3 and the R/4 is the armament choice. While the former has more powerful cannons, it lacks the capability to mount air-to-air missiles while the later is the opposite, weaker machine guns but it is able to use air-to-air missiles.