Athlon Optics High Strength Aluminum Alloy AR Tactical Cantilever Scope Mount for AR RiflesAthlon Cantilever mounts are made in the USA from High Strength Aluminum Alloy. Designed primarily for AR 15 and AR 10 rifles, these are also compatible on various MSR platforms. A four screw ring cap design paired with a 2 nut base and recoil lug cross bolts. A scalloped profile increases surface area while reducing mass, ensuring these rings will hold your scope tight!