The HS503CU is a 20mm micro optical sight designed for rifle and carbine applications. Features include Solar Failsafe, Shake Awake, 12 brightness settings, Holosun’s Super LED with up to 50k hours battery life, and Multi-Reticle System.
 
MRS:2 MOA Dot; 2 MOA Dot & 65 MOA Circle
Up to 50,000 Hours Battery Life (Setting 6)
12 Brightness Setting: 10 DL & 2 NV Compatible
Convenient Tray Battery Compartment
Parallax-free & Unlimited Eye Relief
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Scalarworks LEAP/01:
From its introduction in 2014, the original Low Drag Mount featured our recoil proof ClickDrive™ Quick-Detach mechanism, a precision telescoping clamp with world class return-to-zero, and a CNC milled base with the industry's highest strength-to-weight ratio, all while being as low-profile as a fixed bolt-on mount.
In 2015, the second generation Low Drag Mount became the first Quick-Detach mount ever to be CNC milled from 7075-T6. Its external edges were rounded to minimize stress risers, the thumbscrew was Black Nitrided, and a pair of integral shear lugs was added to the clamp to further improve lateral impact resistance.
Today, the Leap mount features an even stronger base with a forward lean to provide more room for magnifiers, and chamfered side pockets for improved thumbscrew access. The re-designed clamp has discreet hardened steel pins and a stopper to indicate when it's sufficiently open to clear a Picatinny rail.