Marmot 45 Degree Picatinny Rail Mount is Durable Light Weight Solid Aluminum Alloy Construction, Black Anodized Matte Finished makes it Anti-Corrosion 45 Degree Picatinny Rail Mount with Picatinny Weaver Rail Supply 45 Offset Angle to aim on Target. 3 Items in one Package.so you could better use Flip Up Iron Sight.you could use Front Sight, Rear Sight depend on 2 of them. Picatinny Weaver Rail 3 Items in a Package