Sight-Vise™ is a portable precision instrument designed to make sighting long guns and shot guns easy and accurate. The SSV-4 is especially designed to handle all caliber guns. The Magnum Vise is 1" longer and 3" wider than the original vise for additional support to handle the biggest of the big guns. This Vise will allow the shooter to get maximum performance in addition to recoil reduction. The Magnum Sight-Vise™ is also great for repair work and as a gun rest.