A flip-up sight can either be used as a traditional iron sight to compensate for gravity or as a guide to increase accuracy. The tab can be raised on the grooves to compensate for gravity and for aiming purposes. When in the folded position, flip-up sights will act as an iron sight and line up with a forward iron sight on the barrel of the blaster.
Some blasters also have built-in flip-up sights, such as the LongStrike CS-6, which features a flip-up sight at the end of its barrel extension, despite the fact that it comes with a separate flip-up sight. The Vulcan EBF-25 and Rapidstrike CS-18 also feature flip-up sights on the front of their barrels.