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SPUHR ISMS Scope Mount

In Review by Rich1 Comment

So this is a review that is both long overdue and one that I feel I’ve definitely got enough trigger time with to do a review of the product. If you aren’t familiar with the company, SPUHR is based in Sweden. The owner, Hakan Spuhr, makes some of the most finely crafted and beautifully machined firearm accessories on the market. You can see the engineer’s mind at work when you look at the products. Each product seems to be created to address a shortcoming or a pitfall of other products already on the market. As we go through the review you will see what I mean by that!

SPUHR ISMS

The most prominent product in the SPUHR catalog is the ISMS. The acronym stands for Ideal Scope Mounting Solution. This is a one piece scope mount, though you can order separate rings if you wish, that is used to mount a rifle scope to a precision rifle system. One of the things I absolutely love about these mounts has to do with the process of mounting the scope. When you go about mounting a scope to your rifle, one of the things you need to do is make sure that the bottom of the erector housing is plumb with the fall of gravity. Most people level it with the rifle being level, and that can sometimes be an issue when it comes to mounting the scope!

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Leveling wedge used to align the flat beneath the erector housing with the the parallel flat surface at the bottom of the mount!

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Leveling wedge inserted onto the ramp that it slides up to contact the bottom of the scope!

The SPUHR mounts all come with a leveling wedge pictured above. That wedge slips into a precisely machined notch in the side of the mount. As you push the wedge up the ramped notch, it butts up against the bottom of the erector housing. With the ISMS caps loose, the pressure from the wedge on the bottom of the housing will level the scope for you! Which is a real time saver and in my opinion, ingenious feature designed to address a common issue. How do you know when the rifle is level, though? Well, the SPUHR ISMS has addressed that question as well!

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Bubble level included with the mount, it is replaceable if broken…

The ISMS all include an integrated, and replaceable, bubble level which is visible with the weak eye of the shooter. This specifically addresses the issue of firing the rifle while the optics are canted and not plumb with gravity. If you’re not familiar with that issue, you can read the AccuracyTech Article on Canted Reticles!┬áThe fact that this feature is included with every ISMS mount is great. I believe it also offers a counter point to the most common complaint about the ISMS, which is the price. These mounts retail at $410 USD. Consider that is more than double what a top end pair of rings costs and you can begin to understand the griping. However, I believe when the features offered by the ISMS are taken into account, you begin to see the value.

One example is the ease of leveling the scope as you mount it as we already discussed. Another is the bubble level included, which if purchased separately can run you anywhere from the $50-$100+ dollar range depending what you buy. When you consider that, and that competing one piece mount offerings from Nightforce and Badger run between $200-250 USD and it really isn’t that much more expensive. The question becomes whether what it offers over the competition justifies the difference in price. If you’re asking me, the answer is YES!

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Model number and cant engraved, the notch for the leveling wedge is also visible beneath the erector housing

Each ISMS has both the model number and amount of elevation built into the mount engraved on the side. This ensures that you never lose track of which mount you are using and keeps the mounts separate if you have several in your home. This brings up another great thing about the SPUHR ISMS, there are countless models available. You can buy a SPUHR ISMS for just about any scope body diameter and with almost any amount of built in elevation you could imagine. So if you’re putting together an ELR rig, for example, to shoot to 2000+ yards you can purchase an ISMS with 30MOA of cant instead of zero, or 20MOA, that might be more common on hunting rifles.

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Closeup of the accessory interface, the two holes are threaded, and the scalloped ring around them accepts a similar shape on the back of mounts, rails, etc. for a solid lock up

The accessory interface found on SPUHR products is another unique feature. Rather than added accessories by rail, SPUHR came up with an interface that not only ensures proper mounting an alignment of accessories but it reduces weight of both the mount and the accessory to be added to the mount. These little scalloped holes are threaded. The ISMS side of the scallop has space for the accessory side to fill. The two ends mate up and align the accessory. The ISMS mount below is on my competition rifle. I’ve added a cosine indicator, an offset mount for a Burris Fastfire reflex sight, and a picatinny rail for a camera mount. If you have anything you plan to accessorize your rifle with, the SPUHR ISMS definitely makes that extremely easy!

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The SPUHR catalog is fairly eclectic. You can find mounts for countless scopes even oddball sizes that only certain companies use for tube diameters. The accessories available are equally comprehensive. Whether you want to mount night vision equipment, reflex sights, cosine indicators, laser illuminators, whatever poison you pick…SPUHR has a way to mount it to the ISMS.

ISMS Mounting

As I mentioned using the leveling wedge getting a scope into a SPUHR ISMS mount and properly mounted to the rifle is both quick, and easy. There was some talk and argument at one point about whether or not you needed to use Rosin with a SPUHR mount for proper mounting. While SPUHR recommends it and we certainly aren’t going to tell you not to follow the manufacturer’s instructions, we’ve not found it necessary. I’ve only ever seen one person complain of having a scope slip in the mount under recoil and if my memory holds true to reality he refused to return it to the retailer he purchased it from or to the manufacturer for examination. Makes you wonder.

I’ve personally owned several of these mounts, and currently have two of them in rotation. I’ve never used Rosin on the rings with any of them and I’ve never had any issues with the scope slipping under recoil. Even when I fire my 338LM. I’m not saying don’t use Rosin if you want to. I’m saying I don’t think it’s necessary but if you have issues, and if you follow directions like you should, a little bit isn’t going to hurt anything. I torque the caps to 21 inch pounds and go.

Wrapping Up

I really like these mounts. I think the ease of setup is worth the cost of the mount alone. Combine that with an included level and an easy way to add any accessories for different shooting styles and you have a winning combination. These have pretty much become my go-to mount and I’m slowly converting rifles with traditional rings over to SPUHR one piece mounts. I like knowing that I can pull the mount off in one piece and move the scope to another rifle quickly if I need to in order to facilitate shooting a different gun or in the event of an equipment failure. Mile High Shooting is the importer and distributor for the mounts so if you’re in the market for one, I would start with them! If you have any questions or something you want to add, drop it in the comments below!

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Owner and Proprietor of AccuracyTech, LLC. Rich is a Firearms Enthusiast, Precision Rifle Competitor, and Writer. He is committed to bringing readers quality reviews and articles related to the Precision Shooting Sports. If you have any questions for him, please use the contact form on the site.

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