Features of Swampfox Sentinel II 1×20 Red Dot Sight. 20mm objective lens and slim profile for easy concealment on all builds with RMSc optic cut. 10 illumination settings with NV compatibility and Shake N’ Wake Auto on/off. Removeable Rear Sight Guide provides backup support for guiding your eye to the dot as well as coverage for micro pistols that are missing their rear dovetail. Rugged enforced hood design with anti-glare serrations. Built to last with 7075 Aluminum construction and 1500 Gs shockproof. Crafted for concealed carry, Sentinel II showcases a fusion of advanced features in a sleek, cohesive design. This micro dot maintains the standardized RMSc footprint and slimline profile while maximizing visibility with its 20mm window. The most unique feature is the patented removeable rear sight guide installed in front of the window. This guide provides backup support for micro pistols that sacrifice their rear iron sights for dot sight compatibility. Sentinel II displays a 3 MOA dot in either red or green illumination and is equipped with the Shake N Wake auto on/off feature providing a grab-and-go level of readiness. 1 – 20 x. Field of View, Linear. 105.7 – 18.32 ft at 100 yds. Swampfox Sentinel II 1×20 Red Dot Sight. Allen Wrench 1.5mm. M3x0.5 (Thread Length = 10 mm) – 4pcs. #6-32 (Thread Length = 11 mm) – 4pcs. M4x0.7 (Thread Length = 9.8 mmm) – 4pcs. M4x0.7 (Thread Length = 10.8 mm) – 4pcs. M2 (Thread Length = 3mm) – 2pcs. PVC Waterproof Plate – 2pcs. Tritium Rear Sight Guide.