The FAB Defense FRBS is an offset folding backup iron sights (BUIS) kit designed for AR-15, M4, and M16 platforms. Intended as a secondary sighting solution used alongside magnified optics during close-quarters battle (CQB) scenarios. The kit includes a rear backup sight (RBS) adjustable for windage and a front backup sight (FBS) adjustable for elevation — both tool-free. Features a sleek, low-profile design with minimal protruding parts. Finished in tan.
Buying from Drifters
- Flat $15.99 shipping on most orders
- ships in 2–3 business days
- Questions? Call 772.202.0541
- Family-owned FFL 01/08 SOT · A+ on GunBroker, 700+ reviews
- Tan
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Fab Defense
FAB Defense FRBS Offset Folding Backup Rifle Sights Kit - Tan
Specifications
- SKU:
- CHANAFXFRBSOST
- UPC:
- 7290111586767
- Gun Sight Weapon Fit:
- AR-15 M4 M16
- Brand:
- Fab Defense
- Color:
- Tan
- Condition:
- New
- Gun Sight Type:
- Standard
- sight type:
- Offset Folding Backup Iron Sights (BUIS)
- adjustment:
- Tool-free windage (rear) and elevation (front)
- weapon fit:
- AR-15, M4, M16
California Prop 65: this product can expose you to chemicals known to the State of California to cause cancer or reproductive harm. p65warnings.ca.gov
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