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.