Samson Aimpoint Comp M2/M3/M4 Quick Release Offset Base Bottom 1/3 Co-Witness Black. Adding a cantilevered front rail section allows the shooter to shift the base back onto the upper receiver eliminating the need for "bridging the gap" onto the handguard. QR base aligns your Aimpoint Comp at SOCOM height (Bottom 1/3 co-witness) and gives operators and shooters the quick release adaptability they require. Return to zero tested on the Samson range after thorough testing by shotgun and .50 cal. Specifications for Samson Aimpoint Comp M2/M3/M4 Quick Release Offset Base: Manufacturer: Samson Color: Black Gun Model: M3 M4 Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Condition: New Additional Features: 1/3 Co-Witness Package Contents: Samson Aimpoint Comp M2/M3/M4 Quick Release Offset Base Samson 03-00079-01: Aimpoint Comp M2/M3/M4 Quick Release Offset Base Bottom 1/3 Co-Witness Black