The FBUS (fma Back-Up Sight) is a colored, foldable backup sight set. The dual-aperture set is adjustable for windage and fits most weapons equipped with a 1913 Picatinny rail, with a special adaptation for the AR15 / M16 platform.
- Spring-return: Can be activated from either side or by pressing the top.
- Protective wings: Cover the dual apertures on the same level.
- Can be folded with the large or small aperture in place.
- Windage adjustment: Easy and precise adjustment with a locking button.
- Protective wings cover the spring of the A2 front sight.
- Weight: 31g+34g
- Material: Plastic