Fab Defense FRBS Features The Fab Defense FRBS is an offset sight kit designed as a backup sighting solution for rifles running magnified optics giving the shooter a fast transition option for close quarter battle scenarios. The sleek low profile design keeps protruding parts to a minimum so the sights stay out of the way during normal optic use. No tools are needed for windage or elevation adjustment with the rear sight handling windage and the front sight handling elevation. The kit mounts directly to a standard 1913 MIL-STD Picatinny rail making installation straightforward on most AR-15 M4 and M16 pattern rifles. Constructed from durable fiberglass reinforced polymer and metal the sights are built to hold up to the rigors of duty or range use while keeping weight low. Each sight folds down compactly measuring just 52mm in length and 32mm in width in the stowed position and deploying to 30mm in length and 42mm in height when needed. At only 30 grains total weight the kit adds negligible bulk to a rifle already carrying an optic. Finished in Tan this Fab Defense FRBS sight kit is available for sale at GrabAGun for shooters wanting a reliable offset backup sighting system. Fab Defense FRBS Specifications Manufacturer: Fab Defense Model: FRBS Color: Tan Compatible Hosts: AR-15 M4 M16 Length: 52 mm Width: 32 mm Weight: 30 gr Material: Fiberglass Reinforced Polymer and Metal Available At: GrabAGun