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Front Back-Up Sight

FAB Defense

  • Front Back-Up Sight
  • Front Back-Up Sight
  • Front Back-Up Sight
  • Item description
  • Weapon compatibility list
  • Manufacturer information
  • FAB Defense - FBS Front Back-Up Sight - FBS G (Green)

    • FBS is an advanced, low-profile, durable, auxiliary front sight.
    • It can be used with any rear sight, but has been designed to provide an extreme optical advantage when paired with the FAB Defense® RBS Rear Back-up Sight.
    • Sight pin elevation is easily and quickly adjusted without tools.
    • FBS is readily mounted on any 1913 Picatinny rail, making it ideal for use on M4 / AR-15 / M-16 platforms and on the FAB Defense® KPOS.


    • Can be used as a primary or back-up sight
    • Ergonomic angel-wing-shaped front shroud helps center the image with any rear sight, but when used with a matching FAB Defense® RBS Rear Back-up Sight, it creates a precise optical tunnel that ensures more accurate aiming and faster target acquisition
    • 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 elevation adjustments, with positive detent locking
    • Made of extremely durable high-grade polymer and metal

    Suitable for:

    • All 1913 Picatinny rails


    • Colour: Green
    • Material: extremely durable high-grade polymer and metal
    • Weight: 25 g
    • Width: 32 mm
    • Height: 14 mm
    • Length: 52 mm
    • Height (open / deployed): 42 mm
    • Length (open / deployed): 30 mm

    The FBS should never be mounted on a railed gas block.

  • Please note! The offered accessory product fits according to our knowledge on the following weapon models.

    Please also note the exceptions in the item description under “Not suitable for”.

    This information is without guarantee. For further questions you can contact our expert team from Mo.-Fr. 9:00 – 17:00 under the following phone number +49 (0)2206 9519 440.

  • FAB Defense

    FAB Defense

    FAB-Defense® is a registered trademark of FAB Manufacturing & Import of Industrial Equipment Ltd. Fab Defense in Israel.
    FAB-Defense® is mostly common for their various accessories for all kinds of rifles and pistols. Since its inception, FAB-Defense® has been leading in development and manufacture of the highest quality, cutting-edge tactical equipment and weapon accessories for the State of Israel’s Military and Police.
    FAB-Defense® works worldwide together with Special Forces and SWAT teams to develop creative, ability enhancing and practical solutions for the Law Enforcement sector. Operational field trials are essential for the tactical accessory development and have a considerable influence on the production standards.

    Some of the best-known products are the KPOS-Scout, KPOS- G2, T-Pod G2 bipod, PTK and VTS grips as well as all the different rail systems, buttstocks and grips for rifles and shotguns.

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