The A-Spec M3 is manufactured to be compatible for uses with a Shield RMS-C� footprint and it boasts a red auto-brightness control reticle to accommodate shooting at any time day or night. This optic is perfect for subcompact guns and is notoriously durable-aluminum alloy housing IP55 water-resistant shockproof able to withstand up to .375 H&H caliber and operate in temperatures from -22F to 122F. With a battery life up to 100000 hours and an included rubber cover low-profile fixed mount and manual the A-Spec M3 is guaranteed to help you Make Your Mark. - Reticle Type: 3 MOA - Reticle Color: Red - Setting Brightness: Auto - Magnification (x): 1 - Objective overall dimension (mm): 20 X 16 - Eye relief (in/mm): Unlimited - Elevation adjustment range (MOA): 80 - Windage adjustment range (MOA): 130 - Adjustment value (one click =): Continuous - Parallax Setting: 25yd ? - Finish/Color: Matte Black - Body Material: 6061-T6 aluminum - Maximum Caliber: .375 H&H - IP Rating (waterproof): IP55 - Water Resistant - Nitrogen Filled: No - Shockproof (yes/no): Yes 3ft / .9m - Fog Proof: No - Lens Coating: AR Red - Mount Type: Weaver/Picatinny - Footprint: Shield RMS-C� - Battery Type: CR2032 - Battery life hours: 500-100000 - Battery Voltage V: 3V - Operating Temp *F/*C: - 22 to 122 / -30 to 50 - Length sight only (in/mm): 1.6 / 40.8 - Width sight only mount (in/mm): .9 / 23 - Height sight only mount (in/mm): .89 / 22.8 - Weight sight only mount (oz/g): .7 / 20 - Length w/ low mount (in/mm): 1.6 / 40.8 - Width w/ low mount (in/mm): 1.2 / 30.4 - Height w/ low mount (in/mm): 1.33 / 33.9 - Weight w/ low mount (oz.): 1.6 / 46