The Burston fires 3-round bursts, which provides a balance between the lethality of automatic rifles and the accuracy of semi-automatic rifles.
The Burston is a burst-fire assault rifle characteristically known for its unique three-round burst mechanic. It is based off the OrokinBurston Prime. As a burst rifle, the Burston has a lower DPS than calculations suggest. Despite this shortcoming, the Burston performs decently at long ranges, with low recoil and decent damage per burst, provided you land at least one of the shots on a weakspot. Due to the burst-fire mechanic, the Burston may be uncomfortable to some Tenno, but learning the pattern of the bursts can yield great results.
The Burston design was a source of much speculation as it did not directly fit the design aesthetic of the main factions. It was speculated that the Burston was an obsolete Grineer weapon; it was fielded by Grineer Elite Lancers prior to the release of the Hind in Update 9.6 and it also appeared in Grineer faction art. However, its redesign teased in Devstream 53 and subsequent release in Update: Specters of the Rail shows it to be of Tenno origin.
The Burston also appeared in the original Dark Sector video, where it was used by the Grineer. However, the connection between this video concept and Warframe is still unclear.
Strangely enough, the Burston used in the video fires in an automatic manner.