Spitfire Armory - EX Tactical Front Sight - ME for Remington double plain barrel Designed for no-ribbed barrels with factory bead. Bead must be removed on some guns (see installation instructions on Spitfire Armory website). NOTE: This is designed for a 1" diameter extensions tube. If you have an extension tube that has a diameter that is greater than this, buy the Single Front Sight (picture of this set up is listed under Single Sight item). Clamp is CNC machined from 6061-T6 aluminum with matte black hardcoat anodized finish; engineered and machined in USA Comes with shims to fit a range of barrel diameters Optional Front Sight Accessory Rail can fit on either side Use with the Ghost Ring EX Rear Sight for complete system (see image)