This is the Aurora Picatinny rail mount accessory. Crafted of machined aluminum this custom Picatinny rail mount is built exclusively for the Sionyx Aurora Aurora Black and Aurora Pro. The mount is weapons-rated for rifle mounted applications up to a .223 / 5.56 caliber up to 4000 rounds. - Can be used with: - Aurora Black - Aurora Standard - Aurora Pro - Please note this mount is not made or warrantied for the Aurora Sport as the Aurora Sport is not weapons-rated or warrantied to be mounted on a rifle.