TacFire's 3x magnifier allows a rapid transition from 1x to 3x with their push-button flip-to-side integrated pivot mount. Included 3mm spacer also allow perfect alignment with most red dots in the market. Specifications for TacFire Flip-To-Side 3x Magnifier: Manufacturer: TacFire Finish: Type III Hardcoat Anodized Magnification: 3 x Eye Relief: 2.5 in Length: 4 in Weight: 11.8 oz Field of View, Linear: 38 ft at 100 yds Attachment/Mount Type: Picatinny Fabric/Material: Aluminum Width: 2.25 in Height: 2.5 in Color: Black Water Resistance Level: Water Resistant Features of TacFire Flip-To-Side 3x Magnifier Flip to side functionality Picatinny rail adapter only   Package Contents: TacFire Flip-To-Side 3x Magnifier 3mm Spacer