Primary Arms Flip To Side Magnifier Mount 30mm 1.75in Black. Once your magnifier is installed in the 30mm ring simply pulling the magnifier to the rear unlocks the mount allowing you to instantly choose between centerline and off-centerline positions. This mount places the center of the magnifier 1.75 inches above the top of the 1913 Picatinny rail. This magnifier will ONLY line up with raised base optics 30mm red dots Micro dots and other scopes in their standard mounts will not align with this unit. This tough mount Features a lifetime warranty. Specifications for Primary Arms Flip To Side Magnifier Mount: Manufacturer: Primary Arms Color: Black Fabric/Material: Aluminum Quantity: 1 Finish: Matte Weight: 16 oz Height: 1.75 in Ring Height: 1.5 in Gun Make: AR Platform Gun Rail: Picatinny Cant: 0 MOA Gun Type: Rifle Tube Diameter: 30 mm Gun Model: AR-15 Package Contents: Primary Arms Flip To Side Magnifier Mount What firearm models does the manufacturer say Primary Arms Flip To Side Magnifier Mount is compatible with? The manufacturer says that Primary Arms Flip To Side Magnifier Mount is compatible with AR-15Primary Arms 910033: Flip To Side Magnifier Mount 30mm 1.75in Black