FAB Defense Offset Folding Backup Sight Kit Features The FAB Defense Offset Folding Backup Sight Kit is built around a rear back-up sight that adjusts manually for windage and a front back-up sight that adjusts manually for elevation giving the shooter a complete zeroing solution without any tools required. Mounted at an offset angle on a 1913 MIL-STD Picatinny rail the sights sit out of the main sight picture when a magnified optic is in use then fold up quickly into position when a rapid close-range engagement calls for iron sights instead. This offset positioning is specifically designed for CQB scenarios where a shooter needs to transition fast between a magnified scope and a backup sighting option. The sleek low-profile design minimizes protruding parts that could otherwise snag on gear or a sling. Constructed from fiberglass reinforced polymer and metal the kit is built to survive the knocks and drops that come with hard use while staying lightweight at just 0.13 pounds. Measuring 2.04 inches long 1.25 inches wide and 0.55 inches tall the sights add minimal bulk to the top of a rifle s rail system. This particular kit is the left hand variant positioning the offset sights correctly for a left-handed shooter s natural eye alignment. For AR-15 and M4 shooters running a magnified optic who want a fast reliable backup sighting option the FAB Defense Offset Folding Backup Sight Kit is available for sale at GrabAGun. Fab Defense Offset Folding Backup Sight Kit Specifications Manufacturer: Fab Defense Type: Standard Color: Black Hand: Left Hand Material: Polymer Length: 2.04 Width: 1.25 Height: 0.55 Weight: 0.13 lbs Compatible Hosts: 1913 MIL-STD Picatinny Rails Available At: GrabAGun