This 6" long accessory rail will fit a 3/8 dovetail. Use it to offset your scope, tac light ect. 5/8 or 1" from your mounting dovetail. No better quality rail on the market. True Military grade rail made from durable, black anodized steel. Great for adding accessories to Tippmann 98 or A5 markers or any other marker with an available 3/8" mounting surface. Provides a 7/8" top rail for adding weaver or picatinny based accessories to.