F.A.B. Defense115855954
FAB Defense FXFBS Polymer Flip-Up Front Sight for AR-15/M4/M16 - Black$36.80
Availability: In Stock
The FAB Defense FXFRBS flip-up front and rear sights set brings reliable backup iron sight performance to your AR-15, M4, or M16 platform. Whether you're running an optic-primary setup and need a dependable secondary sighting system, or you want to hedge your bets against electronic failure, this matched pair is built to stay out of the way until you need it. The angular, wing-shaped front sight shroud naturally centers your sight picture and works with any rear aperture—but pairs especially well with the matching FAB Defense rear sight for a precision optical tunnel that locks in target acquisition fast.
When folded, these sights sit low and smooth against your rail, snagging on nothing as you move through brush or tight spaces. The instant spring-lock deployment means they snap into battery reliably every time—no wobble, no hesitation. Elevation adjustments dial in quickly and hold firm with positive detent clicks, and you won't need tools to dial them in at the range or in the field. Built from high-grade polymer and metal, they're light enough to leave mounted without penalty and tough enough to handle serious use.
Made for Picatinny rail systems standard on modern AR-pattern rifles, the FXFRBS set mounts securely and gives you the backup sighting insurance that many shooters regard as essential—especially in hunting, tactical training, or any scenario where an optic failure isn't an option. Simple, proven, and uncluttered: that's the FAB Defense philosophy, and it shows in every detail.
| Brand | FAB Defense |
| Model | FXFRBS |
| Type | Flip-up front and rear sight set |
| Compatible Platforms | AR-15, M4, M16, 1913 Picatinny rail |
| Color | Black |
| Material | High-grade polymer and metal |
| Profile (Folded) | Low-profile, compact |
| Adjustments | Tool-free elevation and windage |
| Locking | Positive detent, spring-lock deployment |
The FXFRBS is designed for any AR-15, M4, or M16 platform with a standard 1913 Picatinny rail. They mount securely on the top rail of your receiver or upper assembly wherever you have real estate available.
The FXFRBS can function as either a primary or backup sight system. Many shooters run them as a secondary option behind an optic, while others use them as the main sighting method on iron-sight-only builds.
No. Elevation and windage adjustments can both be made by hand in the field without tools. The positive detent locking mechanism keeps adjustments secure once dialed in.
The FXFRBS is a matched pair: one flip-up front sight and one flip-up rear sight, designed to work together or independently with other sighting options.
SKU: 115682673 • Width: 5in • Height: 1.5in • Depth: 9.25in • Weight: 0.2oz
Availability: In Stock
The FAB Defense FXFRBS flip-up front and rear sights set brings reliable backup iron sight performance to your AR-15, M4, or M16 platform. Whether you're running an optic-primary setup and need a dependable secondary sighting system, or you want to hedge your bets against electronic failure, this matched pair is built to stay out of the way until you need it. The angular, wing-shaped front sight shroud naturally centers your sight picture and works with any rear aperture—but pairs especially well with the matching FAB Defense rear sight for a precision optical tunnel that locks in target acquisition fast.
When folded, these sights sit low and smooth against your rail, snagging on nothing as you move through brush or tight spaces. The instant spring-lock deployment means they snap into battery reliably every time—no wobble, no hesitation. Elevation adjustments dial in quickly and hold firm with positive detent clicks, and you won't need tools to dial them in at the range or in the field. Built from high-grade polymer and metal, they're light enough to leave mounted without penalty and tough enough to handle serious use.
Made for Picatinny rail systems standard on modern AR-pattern rifles, the FXFRBS set mounts securely and gives you the backup sighting insurance that many shooters regard as essential—especially in hunting, tactical training, or any scenario where an optic failure isn't an option. Simple, proven, and uncluttered: that's the FAB Defense philosophy, and it shows in every detail.
| Brand | FAB Defense |
| Model | FXFRBS |
| Type | Flip-up front and rear sight set |
| Compatible Platforms | AR-15, M4, M16, 1913 Picatinny rail |
| Color | Black |
| Material | High-grade polymer and metal |
| Profile (Folded) | Low-profile, compact |
| Adjustments | Tool-free elevation and windage |
| Locking | Positive detent, spring-lock deployment |
The FXFRBS is designed for any AR-15, M4, or M16 platform with a standard 1913 Picatinny rail. They mount securely on the top rail of your receiver or upper assembly wherever you have real estate available.
The FXFRBS can function as either a primary or backup sight system. Many shooters run them as a secondary option behind an optic, while others use them as the main sighting method on iron-sight-only builds.
No. Elevation and windage adjustments can both be made by hand in the field without tools. The positive detent locking mechanism keeps adjustments secure once dialed in.
The FXFRBS is a matched pair: one flip-up front sight and one flip-up rear sight, designed to work together or independently with other sighting options.
SKU: 115682673 • Width: 5in • Height: 1.5in • Depth: 9.25in • Weight: 0.2oz