This long range Soule sight are especially designed for the Pedersoli Gibbs Muzzleloader. They will also work great with Trapdoor Springfields and other long range muzzleloaders. If your rifle does not have an upper tang to mount to, you will have to mount them to the wood at the wrist using wood screws.You must re-drill and tap the factory screw holes on the Pedersoli Gibbs Muzzleloader to mount this sight.