The hs515gm is an ultra durable 20mm micro sight designed for hard-use rifle and carbine applications.The hs515gm is made from 7075 aluminum and includes clear, removable/rotating lens caps, a qd lower 1/3 co-witness (1.63) mount, and is ip68 certified waterproof and dustproof rating.Additional features include our mrs (multi-reticle system) with red super led, 10 daylight and 2 night vision compatible reticle intensity settings, shake awake technology, and up to 50k hour battery life.The battery is housed beneath a side mounted cap for a tool-less replacement.The hs515gm is designed for sporting and professional users.Battery: CR2032Magnification: 1xObjective: 20mmEye Relief: UnlimitedDot Size: 2 MOA Dot/ 65 MOA CircleTube Diameter: 20 MMLength: 2.73"Weight: 3.74 ozFinish: Black AnodizedReticle: 2 MOA Red Dot/65 MOA Red Circle Multi ReticleAdjustment Size: 0.50 MOAProofs: IPX8 WaterproofOptic Coating: Multi-CoatedWindage Elevation: Adjustable