In Stock Spuhr ISMS QDP-4016 Ø34mm Tube 0 MIL (34 mm High) Cantilever Quick Detach Picatinny Scope Mount
"This cantilever QDP mount is perfect for AR-style rifles and forward-mounted optic setups. The 34mm ring size supports modern high-end LPVOs and mid-power scopes, while the 38mm height delivers a comfortable, heads-up shooting position. Spuhr’s QDP system ensures you can remove and re-attach your optic without losing zero — ideal for shooters who swap between optics or transport rifles frequently." - Thomas (Online Sales Associate & Product Specialist).
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 - 34mm
- 0 MIL/MOA
- Height: 38 mm/1.5”
- Length: 151 mm/5.94” (mount body only)
- Weight: 270 g/9.5 oz
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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.
- Designed for extreme‑range precision - Engineered to support the mechanical and optical demands of ELR, PRS, and professional long‑range shooting platforms.
- 10-degree wedge included.
How does the cantilever design improve optical alignment on AR‑style rifles?
The cantilever shifts the optic forward so the scope sits over the handguard instead of crowding the receiver, preserving proper eye relief while maintaining a straight optical axis to the bore.
Why is a 0 MOA cant preferred on this type of mount?
AR platforms are typically used across mixed distances where holding over is common, so a flat mount keeps the scope’s internal adjustments centered for predictable tracking in both directions.
How does forward positioning affect recoil impulse on the optic?
Moving the scope forward reduces vertical oscillation during recoil, helping the reticle settle faster for rapid follow‑up shots.
How does the QDP system compensate for rail inconsistencies on long AR rails?
The cam‑lock engages both top and side rail surfaces, keeping the mount square even if the rail has minor dimensional variation.
Why is 38 mm height important for AR ergonomics?
It aligns the optic with the shooter’s eye when using upright head positions typical of modern AR stocks, reducing neck strain and improving sight acquisition.
Does the cantilever increase tube stress?
Not with Spuhr’s design - the one‑piece body and wide ring spacing distribute weight evenly, preventing bending forces on the scope tube.
How does this mount affect parallax tuning?
The forward optic position provides a more consistent eye position, making parallax adjustment more repeatable across distances.
Is this mount suitable for magnified optics with red‑dot offsets?
Yes. The ISMS interface allows direct attachment of offset red dots without disturbing the scope tube.
How does this mount behave on high‑rate semi‑automatic fire?
The rigid body and recoil lug engagement prevent micro‑movement that can cause zero drift during fast firing cycles.
Does this mount support clip‑on night vision?
Yes. The forward offset leaves rail space for inline clip‑on devices while maintaining proper optical alignment.
How does it compare to fixed mounts for repeatability?
The QDP system returns to the same rail reference points, making it as repeatable as a fixed mount but with faster removal.
How does this mount affect long‑range windage accuracy?
By keeping the optic level and mechanically centered, windage adjustments remain linear and predictable.
Is this mount suitable for heavy scopes?
Yes. The 34 mm rings and wide base prevent tube deformation and sag.
Why choose this mount over a non‑cantilever 34 mm QDP?
AR shooters benefit from the extended eye relief, rail clearance, and improved balance provided by the cantilever design.
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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