KRISS USA, Inc VECTOR, Vector Side Picatinny Rail Kit, 7 Slots, Black KVA-SRKBL00 KRISS USA's Vector Picatinny 7 Slot Side Rail Kit allows you to mount your favorite Picatinny compatible accessories to your KRISS Vector. Attaches to provided hard points on the Vector receiver" or the Mk1" Mk9" and Mk11 Vector handguards. This is recommended for the right hand side of your KRISS Vector receiver only. Accessories mounted on the left side may interfere with the operation of the charging handle.