Recognizing the increasing demand for AR rifle and pistol back-up sight options, Meprolight has introduced the Mepro FUBS (Flip Back-up Sights) tritium-enhanced, self-illuminated front and two-dot rear back-up sights designed to provide a secondary sighting solution in case primary optics go down. With rugged fiberglass reinforced polymer and metal construction, the advanced, low-profile Mepro FUBS sights — mounted to any Mil-Std Picatinny rail — are extremely durable and provide the illumination needed to confidently engage targets day or night. A spring-based locking mechanism allows the shooter to quickly flip them into place when needed. MSRP: $144.99. Contact: us.meprolight.com