Spuhr ISMS QDP-4602 Ø34mm Tube 6 MIL (38 mm High) Quick Detach Picatinny Scope Mount

• Diameter: 34mm
• Height: 38 mm/1.5”
• Length: 121 mm/4.76” (mount body only)
• Weight: 267 g/9.4 oz
• 10-degree wedge included

• 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.

• Spuhr ISMS QDP-4602 34mm High (38mm) Quick Detach 20.6 MOA Picatinny Mount. 

Why is 20 MOA particularly valuable on a 34 mm QDP mount?
Large-tube scopes are often used for extreme long-range shooting. The built-in 20 MOA shifts the optic downward so more of the scope’s internal elevation remains available for dialing at long distances without pushing the erector to its limits.

How does the cant affect optical tracking accuracy?
By keeping the erector closer to its mechanical center, the scope tracks more linearly and consistently, which improves ballistic repeatability when dialing up and back down over large elevation ranges.

Does the angled base make zeroing more sensitive?
It requires careful leveling during installation, but once properly aligned it actually improves zero stability because the scope is not operating at the edge of its adjustment range.

How does the 38 mm height complement the 20 MOA cant?
The additional height provides clearance for large objective lenses and clip-on devices while keeping the shooter’s head position comfortable on modern long-range chassis systems.

Why is the QDP interface important on a canted mount?
On angled mounts, even small shifts can produce noticeable point-of-impact changes at long range. The QDP system ensures the mount returns to exactly the same rail interface every time it is reattached.

How does the 34 mm tube diameter improve rigidity on this model?
The larger ring diameter increases the contact area between mount and scope tube, reducing micro-slippage and improving resistance to torsional loads under recoil.

Is this mount suitable for extremely heavy optics?
Yes. The wide ring spacing and one-piece body distribute the optic’s mass evenly, preventing sag or tube flex that could otherwise affect zero.

How does this mount perform on magnum calibers?
The recoil lug and cam-locked Picatinny engagement prevent forward or rearward movement even under sharp recoil impulses typical of magnum cartridges.

Can this mount be paired with night-vision or thermal clip-ons?
Yes. The rigid alignment and repeatable zero are ideal for inline devices that require consistent optical axis positioning.

Is the QDP-4602 suitable for competition shooting?
Yes. Long-range competitors value the built-in cant and quick-detach repeatability for switching optics or transporting rifles without losing zero.

Does the added cant increase stress on the scope?
No. The cant is in the mount, not the tube. The scope remains straight and evenly clamped, so there is no bending force applied to the optic body.

Why would someone choose this over a flat 34 mm QDP mount?
Shooters who regularly engage targets at extreme distances benefit from the extra mechanical elevation and improved tracking that the 20 MOA version provides.