The MRO-A is a smaller development of the RPO-series with caliber reduced to 72.5 mm, similar to the RShG-2. It is self-contained, disposable, single-shot recoilless launcher with an overall length of 900 mm, weight of , and has a folding forward grip. The sights are RPO-based, with a fixed front and folding ladder-type diopter rear, giving an effective range of 90 m and maximum range of 450 m. The MRO-series includes different versions, again based on RPO versions: MRO-A thermobaric; MRO-D white phosphorus smoke; and MRO-Z incendiary. It was adopted by the Russian Army around 2002 and issued to chemical troops to supplement the larger RPO-A.