The Weaver Multi-Slot Base provides versatility for mounting a variety of optical sights to your firearm, while obtaining optimal eye relief. Tough, lightweight aluminum construction withstands recoil to maintain point of aim. The Weaver Multi-Slot Base accepts all Weaver-style rings, as well as integral mounting devices on tactical sights. Versatility mounting for optical sights Obtains optimal eye relief Lightweight aluminum construction Compatible with Weaver-style rings and integral mounting devices