Spuhr ISMS SP-4616 Ø34mm Tube 6 MIL (34 mm High) Cantilever Picatinny Scope Mount

Spuhr ISMS SP-4616 34mm High (38mm) 0 MOA Cantilever Picatinny Mount

Picatinny mount for use on AR10 rifles

Rings: 34 mm
Tilt: 6 MIL/20.6 MOA
Height: 38 mm/1.5”
Length: 150 mm/5.9”
Weight: 252 g/8.9 oz
Interfaces: 8 sets
EAN: 7340150700331

• Monolithic one‑piece construction - CNC‑machined from a single billet of aerospace‑grade aluminium to eliminate tolerance stacking, flex, and ring misalignment common in multi‑piece mounts.

• High‑rigidity structural geometry - Optimised cross‑section and material distribution provide exceptional torsional and vertical stiffness, maintaining optic alignment under heavy recoil and dynamic loading.

• Hard‑anodised surface treatment - Type III hard anodising delivers excellent abrasion resistance, corrosion protection, and a non‑reflective tactical finish.

• Diagonal ring split design - Improves load distribution around the scope tube while keeping elevation and windage turrets fully accessible, preventing obstruction during adjustment.

• Integrated scope levelling system - Built‑in bubble level allows the shooter to reference rifle cant and optic alignment directly on the mount for precise long‑range shooting.

• Multi‑axis accessory interface -  Machined mounting points on multiple faces of the mount support direct attachment of optical and electronic accessories without adding separate rails.

• Low‑profile accessory mounting - Keeps mounted devices close to the bore axis and centre of mass, preserving rifle balance and minimising parallax and offset errors.

• Precision‑cut recoil lugs and rail interface - Provides repeatable, slip‑free engagement with Picatinny rails for consistent return‑to‑zero performance.

• High‑strength fastener system - Torque‑optimised fasteners maintain clamping force under vibration and recoil, preventing optic movement or zero shift.

• Designed for extreme‑range precision - Engineered to support the mechanical and optical demands of ELR, PRS, and professional long‑range shooting platforms.

How does built-in elevation cant affect mechanical zero optimization?

Integrated cant shifts the optic’s internal adjustment range upward relative to the bore, allowing the erector system to operate closer to its optical center when zeroed at longer distances. This reduces internal spring tension imbalance.

Does MOA/MIL improve tracking consistency during elevation adjustments?

When the erector assembly operates closer to its mechanical center, adjustment tracking tends to remain more consistent because the springs apply more uniform pressure across the adjustment range.

Can MOA/MIL reduce optical distortion at long distances?

Keeping the erector system near its optical center reduces lens edge usage, which can slightly improve image clarity and reduce aberrations during extreme elevation adjustments.

Does forward offset improve shooting ergonomics?

Forward offset allows proper eye relief on rifles with short receiver rails while maintaining a natural head position and consistent cheek weld.

How does the mount handle uneven rail contact surfaces?

The rigid base bridges minor surface irregularities across multiple rail slots, helping maintain alignment even if individual slots are slightly imperfect.

Does ring spacing influence scope durability?

Wider ring spacing distributes recoil forces more evenly along the scope tube and reduces localized stress near the erector housing.

Can mounting position influence elevation travel usage?

Moving the mount forward or backward does not change total elevation travel but can affect shooter comfort and consistency, indirectly influencing long-range precision.

How does torque consistency affect alignment?

Uniform torque across mounting screws ensures even clamping pressure and prevents subtle tilting of the mount body.

Can repeated recoil cycles loosen mounting screws?

Proper torque and screw coatings minimize loosening, but periodic inspection is recommended.

Does the mount maintain alignment after temperature changes?

Uniform expansion across the mount body maintains consistent ring alignment under varying environmental conditions.

How does the mount prevent scope tube slippage?

High friction ring surfaces combined with even torque distribution prevent axial movement of the scope under recoil.

Can over-tightening affect scope tracking?

Excessive ring compression can distort the scope tube and potentially affect erector movement and tracking accuracy.

How does ring alignment influence optical performance?

Precise alignment prevents internal stress that could shift lenses slightly and degrade image quality or tracking precision.

What installation issue most often affects long-range performance?

The most common issue is uneven ring torque which can introduce scope tube stress and reduce tracking consistency.

Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means. 

Please Note: Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.

Please Note: DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY - READ MORE: HERE

COURIERS

We use DPD , RoyalMail, TNT  and UPS courier services for all our orders whether dispatching to the UK or International. As soon as your order has been dispatched you will receive an email with your unique tracking number. We are unable to add delivery notes to your order regarding safe spaces or neighbour deliveries. If you require this service it can be arranged directly with the courier once the parcel is in their network.

IN-STORE ITEMS

These are items that we have in-stock and will be sent out for delivery as soon as possible. We aim to dispatch all orders within 1-2 working days, but during busy periods dispatch may be delayed by a day or so. If you would like to purchase the item in person then please call ahead to arrange an appointment: 01803 611 895.

PRE-ORDER ITEMS

These are usually items that are going to be out-of-stock for a number of weeks or are in short supply. By purchasing a Pre-Order Item you are in effect paying a deposit for your goods. As soon as the item is back in stock yours will be dispatched within 24 hours where possible. Please see individual product pages for current back-in-stock dates. In rare occasions, these dates can be changed by the manufacturers so we recommend staying in contact with Optics Warehouse depending on the product lead time.

INTERNATIONAL DELIVERY & TAXES

In addition to the above information If your delivery address is outside of the UK you may be subject to import duties and taxes, which are levied once a shipment reaches your country. Any such additional charges for customs clearance must be borne by you. You should note that customs policies vary widely from country to country. Optics Warehouse advises each customer to contact their local customs office for further information if they are in any way unsure of local duties or liabilities. Cross border shipments are subject to opening and inspection by customs authorities which means some packages may be opened and re-sealed.

NEED HELP?

If you require any further assistance, please call us on 01803 611 895 or email sales@opticswarehouse.co.uk

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A NOTE ABOUT DPD SHIPMENTS:

• Please be advised that we have now introduced DPD Pins to all DPD orders from Optics Warehouse.
• If your shipment is being sent from Optics Warehouse via DPD you will be sent a Pin Code that must be shown to the courier upon delivery.
• The pincode is sent VIA email & TEXT message. A valid email address and mobile number must be provided at checkout. Emails will be sent from "Riviera House 3PL" - if you do not receive this email please check your junk or spam folders.
• Please note that if you do not display your pin code to the courier driver upon delivery, you will not be able to have your item and you may need to schedule another delivery date to show a valid pin.
• Please view the attached slides HERE for further information!