Trijicon ACOG 4x Green Chevron scope (TA31F-G) 100% aluminum Made in the USA Multi-coated lenses provide superior clarity and light transmitting capabilities with zero distortion. Forged 7075-T6 aircraft aluminum-housing provides for a nearly indestructible sighting system. Forged 7075-T6 aircraft aluminum-housing provides for a nearly indestructible sighting system. Dry-nitrogen filled to eliminate fogging. The ACOG can be used as a CQB sight