The Leapers UTG Accu-Sync Spring-loaded AR 15 riflescope is a collapsible sight for AR15 carbines, fully compatible with the factory bow tie and collimators. Leapers folding sighting instruments for the AR15 at Kolba gun store The Leapers folding sight is made with precision CNC technique from aircraft-grade aluminum, which contributes to its light weight and reliability in harsh conditions. The slit has a folding design, which allows it to be quickly unfolded, for example, in the event of a collimator malfunction. A spring-loaded button is used to unfold the sight, which not only instantly activates the sight, but also securely locks it in the folded position. The sight has two settings designed for short and medium range shooting. The sight is horizontally adjustable with a moled ring, making it easy to use the sight with shooting gloves. Unlike other flip-up-type instruments, the Leapers' sights do not completely cover the Picatinny rail when folded, allowing us to optimally manage its space. The UTG Accu Sync has a low-profile base mounted on the rail with a steel Torx screw. Two Picatinny-compatible MIL-STD-1913 rectangular bolts are responsible for stable seating of the sight on the rail and maintaining zero. The Leapers UTG Accu-Sync Spring-loaded Riflescope is designed to work with the UTG ACCU-SYNC folding musket. Features: lightweight and sturdy aircraft aluminum construction folding flip-up design quick unfolding with a spring-loaded button low-profile base with two bolts (recoil stops) for mounting on Picatinny rail MIL-STD-1913 two settings for shooting at short and medium range Note: The manufacturer recommends the use of a torque wrench with a tightening torque setting of 35 in/lbs for the installation of the riflescope.