FAB Defense AR-15 Iron Sight Set Flip Up - FRBS-B
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FAB Defense
Overview
The FAB Defense AR-15 Iron Sight Set Flip Up - FRBS-B is a pair of folding iron sights designed for quick deployment and reliable performance. Made from durable polymer, these sights provide a lightweight option that won’t add unnecessary bulk to your rifle while maintaining a solid sight picture. This set is commonly found in mid-length gas system builds chambered in 5.56 NATO, making it a practical choice for a variety of uses.
Specifications
September 2026 on GunPartPicker
FAB Defense AR-15 Iron Sight Set Flip Up - FRBS-B ranked #16 of the 73 iron sights builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #28 of the 147 iron sights builders have added. Builds with this iron sight are split between 5.56 NATO (50%) and .308 Win (25%), split between carbine-length (50%) and mid-length (50%) gas systems, and mostly AR-15 (75%, then AR-10 25%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 7 of the 8 retailers we track have it in stock. Prices barely moved in September 2026, holding around $68.03, so there haven't been real sales lately. Buying today, the lowest price is $70.49 at Optics Planet.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Read the guide: AR-15 Iron Sights Guide →Frequently Built With
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all 2 →Builds in the community that include the FAB Defense AR-15 Iron Sight Set Flip Up - FRBS-B
| Build | Parts | Total |
|---|---|---|
 | 28 | $2678.05 |
 | 16 | $2730.63 |
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