The FIROS or FIeld ROcket System was developed in the late 1970s. It is available in two variants. Development of the original FIROS-25 was completed in 1981. It was exported to the United Arab Emirates and two other undisclosed countries, possibly Syria and Libya. An improved FIROS-30 with extended range was accepted to service with the Italian Army in 1987. Both of these artillery rocket systems provide ground forces with area-saturation fire support. By the end of 2002 a total of 146 multiple launch rocket systems of both variants were manufactured. Italian Army also operates the US M270 MLRS.

   A standard 122-mm rocket is similar to that of the BM-21 Grad, but differ in performance and payload versatility. Rockets are loaded in two pre-packed 20-tube rocket pods. A FIROS-25 rocket is 2.68 m long and weights 58 kg. Maximum range of fire of 25 km. A FIROS-30 rocket is 2.82 m long and weights 65 kg. Maximum range of fire is 34 km. Rockets are available with HE-FRAG, cluster, smoke, incendiary and training-practice warheads. Cluster warhead contains anti-personnel, anti-tank submunitions, or pre-fragmented elements. Rockets with cluster warheads are longer and heavier. Both FIROS-25 and FIROS-30 rockets can be fired from 122-mm BM-21 Grad series launchers. In case of emergency FIROS MLRS can also fire the Grad rockets. Vehicle can fire its rockets within 5 minutes from travelling.

   Both variants of the FIROS are based on Iveco 6x6 heavy utility trucks. An armored cab was proposed as an option. Rocket launcher can also be mounted on any 6x6 heavy utility truck, with a payload capacity of 10 000 kg.

   A battery of FIROS consists of 6 mobile launchers, 6-12 reloading vehicles, fire control vehicle and command vehicle.

   This multiple launch rocket system is reload by replacing their rocket pods. It can also be reloaded manually. A reloading vehicle is fitted with a crane and carries four rocket pods. Reloading usually takes places well away from firing position, to avoid counter-battery fire.