Fab Defense Front and Rear Back-Up Flip Up Sight (FBS + RBS)

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.