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Questions & Answers
Will this sight work with a magpul front sight? Expert Answer

The FAB Defense Rear Polymer Flip-up Rear Sight is compatible with standard height front AR sights. So yes, it will work with the Magpul Flip up front sight.

by Hunter, Gear Expert, April 7, 2022
I see this will fit on the picatinny rail but will it fit the weaver rail as well Expert Answer

FAB Defense guarantees fitment with all picatinny rails but does not guarantee fitment with all Weaver.

by Tom B, Gear Expert, August 26, 2021
Customer Reviews
Helpful Positive Review Not a bad sight by G, June 19, 2019
Not a bad sight.. Was looking for something different.. But I'd like it better if it was a button flip up like magpul.. It's a manual flip.. But looks great and works as it should.. Would recommend to others
1/1 found this helpful
Helpful Negative Review Rear sight by J Wood., November 4, 2021
It did not come with the Allen wrench to sight it in. And I am very much not happy with my order. How am I going to sight in the product you sent me without the tools that should have came with the package?
1/23 found this helpful
Most Recent Reviews not good sight by Dak, May 16, 2021
The issue was that the rear sight shifted too far to one side on the rail when tightened even the slightest bit, causing near-maximum windage to find a zero (it is not an issue with the weapon). There is no spring assist either. These must be manuall...
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1/6 found this helpful
Most Recent Reviews fab front/rear sights by Mike O, Verified Owner, August 22, 2024
Nice, well made sights. Im very happy wiith these sights. Easy adjustments. Will buy more.
Most Recent Reviews Quality polymer sight by E, Verified Owner, May 19, 2024
Quality seems to be on par with magpul. Sights are manual flip up and down and do not lock into place. Haven’t had any issues with them staying locked in place so I don’t see this as an issue at this point in time. Would buy again for bargain polymer...
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Most Recent Reviews Best polymer sights for the money by Eugene Moses Kalashnikov, Verified Owner, August 29, 2022
These come in at a great value in my opinion. I was a little hesitant at first because there is no manual locking mechanism for the sight in the upward position, meaning I'd like to have to push a button to fold them down, but my worries were elimin...
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Read All 9 Reviews
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Product Info for FAB Defense Top Mounted Deployable Rear Sight

The FAB Defense Polymer Rear Sight can be used as both a primary or back-up sight to your current optic. FAB Defense designed these AR 15 Parts with ergonomic angel-wing-shaped shrouds that help center the image with any front sight so that you can accurately use these in conjunction with a front back-up sight or other optic. With an instant spring-locked mechanism for deployment, the FAB Defense RBS will never slip, break, or deform, offering outstandingly reliable performance in the field. Equip the FAB Defense Rear Back-Up Sight on your weapon today for precise views down range every time.image

Specifications for FAB Defense Top Mounted Deployable Rear Sight:

Manufacturer: FAB Defense
Condition: New
Sight Position: Rear
Gun Model: M16, M4, AR-15
Gun Make: AR Platform
Fabric/Material: Polymer
Height: 14 mm
Length: 52 mm
Illumination Type: Non-Illuminated
Hand: Ambidextrous

FAB Defense Polymer Rear Sight, 1S0-IRN-RPFUS

  • 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

Package Contents:

  • FAB Defense Rear Polymer Flip-up Rear Sight, 1S0-IRN-RPFUS

FAB Defense Top Mounted Deployable Rear Sight Orderable Models

List of Orderable Models

FAB Defense OPMOD Rear Polymer Flip-up Rear Sight, Grey , MPN: FX-RBS-OPMOD Grey-KIT2023 , Code: 1S0-IRN-RPFUS-FX-RBS-OPMOD-Grey-KIT2023
FAB Defense Top Mounted Deployable Rear Sight, Black, FX-RBS , MPN: fx-rbs , UPC: 7290105941992 , Code: 1S0-IRN-RPFUS-FX-RBS
FAB Defense Top Mounted Deployable Rear Sight, Flat Dark Earth, FX-RBST , MPN: fx-rbst , UPC: 7290105947574 , Code: 1S0-IRN-RPFUS-FX-RBST
FAB Defense Top Mounted Deployable Rear Sight, OD Green, FX-RBSG , MPN: fx-rbsg , UPC: 7290105947567 , Code: 1S0-IRN-RPFUS-FX-RBSG
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