Primary Arms PLx HTX-1 Reflex Red Dot Sight ACSS Vulcan Dot Black. Its patent pending Modular Chassis System (MCS) is compatible with almost all existing optics cut pistols and offers the lowest possible centerline co-witnessing with standard height iron sights. With each optic comes an RMR Type A RMR Type B (raised screw bosses) and GLOCK MOS plates making it easy to mount to your pistol right out of the box. SIG M17/M18 available for MIL/LE only. This pistol reflex sight is part of the top tier optics line called PLx. PLx optics meet the exacting demands of professional use offering impeccable glass clarity and advanced features from state-of-the-art production facilities. It features side illumination buttons allowing you to easily cycle between the 11 total brightness settings including 3 night vision settings while the side mounted CR 2032 battery tray makes it easy to swap batteries without removal of the optic. Additionally it features Primary Arms Autolive motion sensing technology that ensures maximum runtime. Built for precision in extreme conditions the HTX-1 utilizes a narrow-band glass doublet lenses with wide-band anti-reflective coatings for a crystal-clear sight picture and its rugged 7075 Aluminum construction is tested and proven reliable against intense exposure and abuse. Specifications for Primary Arms PLx HTX-1 Reflex Red Dot Sight: Manufacturer: Primary Arms Color: Black Finish: Hardcoat Anodized Fabric/Material: Aluminum 7075-T6 Magnification: 1 x Illumination Type: LED Illumination Color: Red Brightness Settings: 11 Adjustment Type: MOA Adjustment Click Value: 1 MOA Emitter Type: Enclosed Battery Type: CR2032 Lithium Metal Battery Quantity: 1 Battery Life: 10001 - 25000 hours Weather Resistance: Shock Resistant Waterproof Water Resistance Level: Waterproof Shockproof: Yes Gun Make: SIG Sauer Gun Model: SIG Sauer M17 SIG Sauer M18 Length: 1.78 in Width: 1.56 in Height: 1.05 in Weight: 1.74 oz Magnification Type: Fixed Lens Finish: Multicoated Red Dot Sights-Footprint: Holosun 509 ACSS Optic Cut: Trijicon RMR Glock MOS Gun Type: Pistol Features of Primary Arms PLx HTX-1 Reflex Red Dot Sight Narrow band glass reflex doublet with wide band A.R. coating Patent pending modular chassis system Includes RMR A RMR B (raised screw bosses) and MOS mounting interfaces Low mount height allows for co-witness with stock height sights Push button illumination with 11 settings including 3 night vision Autolive technology conserves battery life Red Dot Bright illumination Side mounted battery compartment Package Contents: Primary Arms PLx HTX-1 Reflex Red Dot Sight Case Carriers and screws Battery Primary Arms PLx-HTx-1-ACSS: PLx HTX-1 Reflex Red Dot Sight ACSS Vulcan Dot Black