This is Bandai146733 F91 Gundam

The F91 Gundam F91 ("F91" standing for "Formula 91") is the titular mobile suit of Mobile Suit Gundam F91. The unit is piloted by Seabook Arno. Another F91, colored dark blue and yellow, is piloted by Harrison Martin.

Reduced in height compared to its famous predecessor (15.2 meters compared to 18.5) and mass (19.9 tons fully loaded while the RX-78 took off fully loaded at 60.0), the F91 was regardless immensely more powerful. It is armed with a pair of machine cannons in the chest, vulcan guns in the head, a pair of back mounted variable speed beam rifles, beam sabers, newly developed beam shield, which was much more effective then the solid state shields used by past mobile suits, and can be optionally equipped with a beam rifle and a beam launcher. Although the F91 was smaller and lighter than its predecessors, these features served to make it faster, more maneuverable, and all-around more efficient.

The greatest weapon of this Gundam was its twin Variable Speed Beam Rifles, which (despite the designation "beam rifle") were actually built-in weapons drawing their power from the mobile suit's fusion reactor. They could vary the speed of the beam fired to produce different types of beam and thus the damage dealt. Its other unique feature is the bio-computer, which instead of reading the pilot's thoughts, feeds battle data directly to the pilot's brain. However, due to the mental stress, it's best utilized by a newtype. These components, however, made it generate excessive heat. Thus, aside from numerous cooling ducts and heat sinks on its shoulders, its mouth can be opened as a vent; the F91 can also dissipate excess heat by shedding the outer layers of its armor. This process creates afterimages of the mobile suit made up of metallic particles, which can deceive not only the eyes of enemy pilots, but also radar and other sensors. This phenomenon came to be known as the Metal Peel-off Effect, or MEPE for short.