Spuhr SP-4603B: 34mm Picatinny Mount 20 MOA - 1.5", Extended Housing

Spuhr : SP-4603B
SPUHR SP-4603B - 34mm Picatinny Mount 6MIL/20.6MOA - 1.5"
Ring Size:  34mm
Tilt: 6 MIL/20.6 MOA
Height:  38mm (1.50in)
Length:  147mm (5.79in)


For scopes with long erector housings such as U.S. Optics TPAL and Nightforce BEAST.

Distance from ring to ring is 82 mm/3.228".

10-degree wedge included

Spec Sheet (PDF)


Prevents damage on scope due to flexing during heavy recoil or rough environment. The snipers rifle and the spotters carbine can have the same mount, enabling the use of same equipment and accessories. Rings are grooved inside to get a better grip of the scope and enabling gluing of the scope. The mount is milled out of one billet of material instead of being screwed together from small parts.

Scope Rotation

Patent pending solution for indexing the rotation of the scope, using an included tool/gauge to index the scope correctly to the mount and gun. Important since an incorrectly indexed scope unintentionally will also have a sideways adjusted point of impact and since it will be adjusted sideways when it is adjusted for elevation.

Mounting Placements

Traditionally lasers have been mounted on the forend of the rifle, a solution with drawbacks. For the same reasons you don′t want your barrel to touch the forend, you don′t want the sights to be mounted on the forend. Our mounting system has a minimum of seven interfaces for accessories and the laser can easily be mounted on the mount, giving the advantage of an undisturbed laser and a weight more central on the gun instead of forward.

Accessible and Readable Dials

The rings are cut 45 degrees instead of the usual horizontal, providing several advantages. The screws holding the parts together are not in the way of the knobs, thus the shooter can quickly determine the settings of the knobs. It also gives the shooter a horizontal line that helps the shooter not torotate his gun unintentionally. The rings have index marks on the top and right side, making low knobs more easily readable.


Possibility of using various accessories such as angle cosine indicator, back up sights, lasers, illuminators, Night vision mounts etc. With traditional mounts this can be achieved only if there is sufficient space on the middle tube for additional rings, which there rarely is. Ideal Scope Mount Systems have interface surfaces directly on the mount, making it possible to mount accessories either by Picatinny rails or as direct interfaces for certain accessories such as angle cosine indicators and red dot sights. A selection of interfaces for popular accessories are available, and others can be made to specification.



20 MOA


Write a Review
  • 5
    Pro level

    Only buy this if you know how to mount a scope or you are 100% sure you know a person that can mount it for u. It’s the best mount ive ever used. A must for high recoil Guns.

  • 5
    The best scope mount money can buy.

    The Spuhr ISMS is simply the best scope mounting system that money can buy. If you're looking for the best, look no further. Pairs of rings are obsolete.

    The ISMS is a true system, that you can configure with accessory parts and mounts to exactly fulfill whatever your individual needs are. The quality is extraordinary, and once you see one, you'll understand why they're the best.

    This particular model has a longer spacing between the rings, to accommodate scopes with larger turret assemblies. It beautifully fits my US Optics 5-25x58, which has a very long turret section. It is the perfect fit for this scope on a Remington 700 type rifle.

    It has a 6MIL/20.6MOA tilt built in, for mounting rails that do NOT already incorporate a tilt. (If your rail does, then you need on of the 0 cant models.)

    I have never used a scope mount that has impressed me like this one does. Try one, and you'll understand why. It is a gigantic leap beyond traditional scope rings, or any of the other one piece units I've seen. Particularly with precision rifles, there are things you absolutely can't skimp on. The scope is one, and how you attach that scope to your rifle is equally important. It must be perfect to extract the maximum benefits of your weapon system. Try a Spuhr and you'll never regret it.