FAB Defense FXFBS Front Back-Up Sight for AR-15/ M16/ M4 Low Folded Profile Spring-Locked Deployment Black Polymer & Metal

When your AR platform needs a secondary sighting solution, a backup sight bridges the gap between primary optics failure and target acquisition. The FAB Defense FXFBS delivers low-profile deployment without bulk. Shooters from Fremont to across the Bay trust backup iron sights as essential redundancy. Before purchasing, review California firearm laws to ensure your build meets local requirements.

Spring-Locked Deployment and Folded Storage

This flip-up front sight collapses flat against your upper receiver when not in use, clearing the way for optics mounting. The spring-lock mechanism deploys reliably under field conditions without manual adjustment between shots. Polymer and metal construction balances durability with weight. TacticCAL Gun Store stocks quality backup sights for AR-15, M16, and M4 platforms. The low-profile design maintains receiver real estate for red dots, scopes, or magnified optics. TacticCAL is your local gun store in the Bay Area.

Frequently asked questions

Does this front sight work with all AR-15 upper receivers?

The FXFBS is designed for standard Picatinny rail systems on AR-15, M16, and M4 uppers. Verify your receiver has a top-mounted rail section before purchase. Compatibility with aftermarket uppers varies—confirm mounting surface.

How quickly does the spring-lock mechanism deploy under stress?

Spring-locked deployment activates with light finger pressure and locks into position immediately. The mechanism is designed for fast transitions during range work and tactical drills. Test deployment before relying on it in critical situations.

Where can I ship an online gun order near San Jose?

TacticCAL Gun Store in Sunnyvale receives online firearm orders for buyers throughout the South Bay, including San Jose, Santa Clara, and the surrounding Bay Area. TacticCAL is your gun shop Santa Clara in the Bay Area.