The solid magnesium construction weighs less than a pound, making it easy to pack and carry in the field. It fits sporter rifles, quad-rail AR platforms for modern sporting rifles, and crossbows. Compatible with any 1/4 -20 or 3/8 -16 mounting stud, switcheroo, or arca-swiss system, the Ultralite is the lightest addition in our Deathgrip series that's tough enough to hold its own in the field.