Magpul recently announced the newest addition to its backup sight family with the MBUS 3 front and rear sights, which bring together the best strengths of the original MBUS and MBUS Pro Sights with a new backup sight system.
The MBUS 3 is smaller in size than the MBUS, sitting at .44 inches in the folded position and 1.15 inches in width. Influenced by the design of the MBUS Pro, the third iteration features a rear sight constructed from Magpul's impact-resistant polymer, allowing for an ultralight and extremely durable design. The front sight features a tool-less elevation adjustment with dial width enhanced front sight similar to the MBUS Pro, as well as ambidextrous push-button deployment.
The sight utilizes the same spring-loaded technology as the MBUS while retaining the same sight height, standard for the AR, when deployed. The MBUS 3 rear sight also features a rapid-select aperture system.