FAB Defense Rear Back-Up Sight

The RBS is an advanced, dual aperture, durable and
low-profile auxiliary rear sight. It can be used with any front sight and was
designed for more accurate aiming and faster target acquisition. Windage is
easily and quickly adjusted without tools.

 

RBS is readily mounted on any 1913 Picatinny rail, making it
ideal for use on M4 / AR-15 / M-16 platforms and on the FAB Defense® K.P.O.S.

 

Advantages:

Can be used as primary or back-up sight

Ergonomic angel-wing-shaped shroud helps center the image
with any front sight, and when used with a matching FAB Defense®  FBS Front Back-up Sight, it creates a precise
optical tunnel that ensures more accurate aiming and faster target acquisition

Dual apertures are 3mm for longer eye relief mounting, low
light, and faster target acquisition; and 1.5mm for shorter eye relief mounting
and greater accuracy; each is instantly selectable to match conditions

Low folded profile is smooth and inconspicuous, and will not
snag on gear, webbing, or brush

Instant spring-locked deployment mechanism will not slip,
break or deform

No tools needed for easy, rapid windage adjustments, with
positive detent locking

Made of extremely durable high-grade polymer and metal

Available in black, olive drab green, or flat dark earth

Compatibility:

All 1913 Picatinny rails