Athlon Optics Cantilever Scope Mounts 34mm 20 MOA Black. 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 Specifications for Athlon Optics Cantilever Scope Mounts: Manufacturer: Athlon Optics Fabric/Material: Aircraft Grade Aluminum Color: Black Base/Mount Type: Cantilever Ring Mount Ring Height: 1.43 in Weight: 6.8 oz Width: 2 in Country of Origin: USA Gun Type: Rifle Quantity: 1 Finish: Hard Anodized Features of Athlon Optics Cantilever Scope Mounts: Steel Recoil Lug 4-screw Cap Retention Aircraft Grade Aluminum Scalloped Design Hard Anodized Finish Package Contents: Athlon Optics Cantilever Scope Mounts Athlon Optics 701017: Cantilever Scope Mounts 34mm 20 MOA Black