Which standard rifle firing position provides the least support?

The standing position provides the least support when firing a rifle because the shooter's entire weight is on their feet, with no external support from the ground. In this stance, the rifle is held up solely by the shooter’s muscles and grip, making it more difficult to achieve stability and accuracy. The lack of a solid rest or additional support means that any small movement or muscle fatigue can significantly affect the shot's placement.

In contrast, positions like prone, sitting, and kneeling offer varying degrees of support. In the prone position, the shooter lies flat on the ground, which provides excellent stability, while the sitting position allows for a stable base with contact points from the legs and the ground. The kneeling position combines elements of stability from a seated position but still offers more support than standing due to contact with the ground. Each of these positions enables the shooter to manage recoil better and maintain better control over their aim.