Two variations of the D&L extended flat top rail are now available: a full length cross slot version and a forward cross slot only version.The full length cross slot version allows shooters to mount a wide variety of optics, including compact red dot sights all the way to the rear of the rail and close to the shooter's eye.

The forward cross slot only version allows shooters to mount magnified rifle scopes with larger oculars (rear eye pieces) and still use low to medium height scope rings. This keeps the overall height of the entire rifle scope very low and allows the shooter to maintain a proper cheekweld on the stock. Keeping the scope low to the bore will also allow the shooter to keep a very efficient trajectory pattern down range.

The forward cross slot only version also has a series of 1/4 - 28 threaded holes in the centerline of the mount. These holes allow the shooter to square the flat on the underside of their rifle scope with the mount. Simply position and tighten the scope ring bottoms on the rail, set the scope in place, and lightly attach the scope ring tops. Then use a 1/4x28 bolt up from the bottom of the threaded hole in the mount which is lined up with the flat on the underside of the scope. Carefully slide a peice of flat stock between the scope flat and the 1/4-28 bolt, then square the scope with the flat stock and LIGHT 1/4-28 bolt tension. Snug the ring top screws. Remove the bolt and flat stock. Then tighten the ring top screws. (15-20 inch pounds is a common torque setting, but consult your optic's manual. Also use # 222 or #242 blue loctite on all scope ring threads).

At this point you can move your rail mounted scope from one flat top rifle to another flat top rifle thanks to the scope being already square with the mount, and the 4 crossbolts of the extended rail being capable of self squaring the rail onto each new flat top rifle. For shooters wanting the ultimate in rigidity and a more permanent mount, either of the above extended rails can also be drilled from the top to screw top down into your flat top reciever. Pilot holes are already in place in the forward cross slot only version of the rail.