Fab Defense Front and Rear Back-Up Flip Up Sight (FBS RBS)
$53.06
$74.28
The dual aperture FBS Front RBS rear sight is windage adjustable and can be mounted on all 1913 Picatinny rails, but is specially made for the M4 / AR-15 / M-16 platform and the K.P.O.S. Advantages: Very low profile & slim design. Can be used as a primary or backup sight. State-of-The-art ergonomic & ambidextrous design. All manual configuration, no tools needed for windage adjustments. Durable high-grade polymer & metal construction. Spring-based locking mechanism - will not break or deform.
