New for 2020- Athlon 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!