In Stock Spuhr ISMS SP-4801C Ø34mm Tube 13 MIL (30mm High) Gen 3 Picatinny Scope Mount
"The SPUHR ISMS Gen 3 SP-4801C is a precision-engineered one-piece mount that combines solid construction with practical versatility. Its medium height and 13 MIL incline make it ideal for long-range shooters seeking consistent elevation adjustments without compromising stability. The 34mm body perfectly balances optic clearance and weight, ensuring reliable zero retention even under the harshest conditions. For tactical, competition, or general precision use, this mount is a dependable choice that won’t let you down." - Thomas.
The Spuhr ISMS (Ideal Scope Mount System) is a high-performance mounting solution engineered for shooters who demand unmatched stability, precision, and modular versatility. Its single-piece, billet-machined aluminium construction provides exceptional rigidity, virtually eliminating flex under recoil and ensuring repeatable zero for long-range, tactical, and competition applications.
The system’s diagonally split rings give unobstructed access to elevation and windage turrets, allowing fast and precise adjustments without interference. An integrated levelling system and alignment wedge ensure the optic is perfectly level during setup, critical for extreme-range accuracy and consistent shot placement.
Multiple interface points along the mount allow secure attachment of a wide range of accessories, from lasers and rangefinders to backup optics and night-vision devices, without affecting rifle balance or ergonomics. Machined from aerospace-grade aluminium and finished with hard-anodised coating, the ISMS offers exceptional durability, corrosion resistance, and mechanical integrity under heavy recoil and field conditions.
With its combination of precision machining, modular functionality, and rock-solid strength, the Spuhr ISMS is designed to elevate any rifle platform, providing a foundation for accurate, repeatable, and adaptable long-range performance.
Ring Height - 30mm

- Rings: 34 mm
- Tilt: 13 MIL/44.4MOA
- Height: 30 mm/1.18”
- Length: 120 mm/4.72” (body), 130 mm/5.12” (OAL)
- Weight: 217 g/7.7 oz
- Interfaces: 7 sets
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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.
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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.
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Hard‑anodised surface treatment - Type III hard anodising delivers excellent abrasion resistance, corrosion protection, and a non‑reflective tactical finish.
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Diagonal ring split design - Improves load distribution around the scope tube while keeping elevation and windage turrets fully accessible, preventing obstruction during adjustment.
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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.
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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.
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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.
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Precision‑cut recoil lugs and rail interface - Provides repeatable, slip‑free engagement with Picatinny rails for consistent return‑to‑zero performance.
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High‑strength fastener system - Torque‑optimised fasteners maintain clamping force under vibration and recoil, preventing optic movement or zero shift.
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Designed for extreme‑range precision - Engineered to support the mechanical and optical demands of ELR, PRS, and professional long‑range shooting platforms.
- Spuhr ISMS Gen 3 SP-4801C 34mm Medium (30mm) 44.4 MOA Picatinny One-Piece Mount
- Manual
- "Wedge" levelling key
How does extreme cant affect erector system centering for ultra‑long‑range shooting?
Large cant angles shift the mechanical zero significantly downward within the scope’s adjustment range, allowing maximum upward elevation travel. This keeps the erector assembly operating near its central position where spring forces remain balanced and tracking behavior is more predictable.
Can extreme cant improve tracking repeatability at long distances?
When the erector system operates closer to its mechanical center, adjustment forces remain more uniform across elevation changes. This reduces the likelihood of hysteresis or slight return-to-zero deviations after large adjustments.
Does extreme cant influence optical clarity at high elevation settings?
Scopes adjusted near their internal limits may use lens regions farther from the optical center. Using cant reduces required adjustment and keeps the optical path closer to its optimal alignment.
Can improper torque affect cant alignment accuracy?
Uneven rail screw torque can introduce slight angular deviation in the mount body. This alters the effective cant angle and changes the elevation relationship between optic and bore.
How does extreme cant affect zeroing procedures?
Zeroing typically occurs near the lower portion of the elevation adjustment range. This requires careful adjustment to avoid reaching the lower mechanical stop prematurely.
How does ring alignment affect precision at extreme ranges?
Small alignment errors produce larger angular deviations at long distances. Precise ring alignment ensures the optical axis remains parallel with the mount structure.
How does cant influence internal scope spring pressure?
Large upward adjustments compress erector springs unevenly in flat mounts. Cant reduces required adjustment and maintains more balanced spring compression.
Does mount placement affect elevation travel usage?
Forward or rearward placement does not change total elevation travel available. It only affects eye relief and shooting ergonomics.
Can excessive ring torque affect scope tracking?
Excessive torque can slightly deform the scope tube and increase friction in the erector mechanism. Increased friction may produce inconsistent adjustment increments.
Does temperature variation affect cant accuracy?
Uniform thermal expansion preserves the geometric relationship between rings and base. The cant angle remains mechanically unchanged across temperature variations.
Can extreme cant limit close-range zeroing?
Large cant angles reduce downward adjustment travel available. Extremely close zero distances may approach the lower mechanical limit of the scope.
How does the mount maintain alignment during repeated adjustments?
The monolithic structure prevents ring movement relative to the base. This ensures that scope adjustments occur within a stable mechanical reference frame.
What installation error most often affects ultra-long-range performance?
Uneven rail screw torque is the most common cause of angular misalignment. This changes the effective cant angle and reduces usable elevation consistency.
Delivery costs & estimated arrival
Find your country below for the delivery charge and how long your order should take to reach you. All orders ship with FedEx. Estimates are in working days and exclude weekends and public holidays.
| Country | Up to 2kg | 2kg – 30kg | Estimated delivery | ||
|---|---|---|---|---|---|
| Order under €350 | Order €350 & over | Order under €350 | Order €350 & over | ||
| Austria | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| Belgium | €8.95 | €14.95 | €14.95 | €14.95 | 4-6 working days |
| Bulgaria | €11.95 | €31.95 | €31.95 | €31.95 | 7-9 working days |
| Croatia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Cyprus | €14.95 | €89.95 | €89.95 | €89.95 | Contact us |
| Czechia | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Denmark | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Estonia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Finland | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| France | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Germany | €8.95 | €14.95 | €14.95 | €14.95 | 5-7 working days |
| Greece | €11.95 | €31.95 | €31.95 | €31.95 | 8-10 working days |
| Hungary | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Ireland | €6.95 | €6.95 | €8.95 | €8.95 | 2-4 working days |
| Italy | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Latvia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Lithuania | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Luxembourg | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Malta | €14.95 | €89.95 | €89.95 | €89.95 | Contact us |
| Monaco | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Poland | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Romania | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Slovakia | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Slovenia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Spain | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| Sweden | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
Returns & withdrawal
Which option you use depends on why you are sending the item back.
Changed your mind?
You have 14 days from receiving your order to withdraw from your purchase. Use our Withdrawal from Contract form to tell us. It is the quickest way, and we will then email you a free returns label.
If you would rather post the item back yourself to our returns address in Ireland, you pay the postage. Full details are on our Returns page.
Withdrawal from ContractFaulty, damaged or wrong item?
If your item arrived faulty, damaged or not what you ordered, please follow the steps on our Returns page. We cover the cost of returning these items.
Full details of all our return options are on that page.
Returns pageDelivery prices are shown in euros and confirmed at checkout.

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