EAW Quick release Z-Rail (Zeiss). The ZM/VM rail design is a 45° prism with an internal recess for mounting elements found on euro style optics.
When comparing the rail mount to the standard ring mount, it's easy to see all the benefits it offers. Rings can leave marks on the main tube, but not just superficial marks, the structural integrity of the scope can be compromised leaving the user with a corrupted image and tracking issues. Rifle scopes mounted with a rail are less subject to recoil shock and can withstand relentless fire of almost any caliber. If they are mounted with rings, they must be realigned after a while. Mounting with a rail provides perfect horizontal level because the reticle is aligned with the rail.
Rail mounting is always preferable to ring mounting and going forward most European high end riflescope manufacturers will exclusively use this approach.
Height (BH): 10mm
Rail: Zeiss ZM/VM rail
Material: Steel