GBRS Group Lerna Mount Kit Aimpoint Acro FDE. 91'' Optic Centerline for faster target ID regardless of gear/equipment obstructions ie. EarPro/Comms headsets Gas masks/CBRN and Night vision use. A higher Optic allows for a more athletic posture and ''Heads up'' attitude that enables the end-users to maintain a vertical spine which translates to body armor or ''presenting plates'' to the threat. This ''Heads up'' style allows for faster processing speed and increased situational awareness. Specifications for GBRS Group Lerna Red Dot Sight Mount: Manufacturer: GBRS Group Gun Make: AR Platform Gun Type: Rifle Fabric/Material: 6061-T6 Aluminum Base/Mount Type: Top Rail Mount Attachment Type: Picatinny Height: 2.91 in Condition: New Package Contents: GBRS Group Lerna Red Dot Sight Mount GBRS Group GEAR-LERN-ACRO-FDE: Lerna Mount Kit Aimpoint Acro FDE