- Adjustable illumination settings
- Fully multicoated optics
- One piece, aircraft grade aluminum chassis
- Fog proof
- Nitrogen purged
- Included picatinny rail mount
Unlike the majority of open sights in the market that have two separate upper pieces of chassis that hold the lens in place, the OS11 upper body is constructed by a whole piece of aluminum that can withstand thousands of rounds and reduces the tendency of lens cracking. The uniquely designed battery chamber, located on the right side of the sight, allows you to change your battery effortlessly and quickly without dismounting your sight and losing your zero. The illumination switch buttons are conveniently located on the left side and can be simply turned on and off by holding on the + button. To remove the picatinny rail mount, just simply loosen the two top screws on the main chassis.