Spuhr ISMS QDP-4002 Ø34mm Tube 0 MIL (38 mm High) Quick Detach Picatinny Scope Mount

• 0 MIL/0 MOA
• 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-4002 34mm High (38mm) Quick Detach 0 MOA Picatinny Mount. 

How does this mount behave on semi-automatic precision rifles?
The QDP-4002 handles the sharp, cyclic recoil of semi-autos very well because its one-piece body and wide rail engagement prevent micro-shifts between shots.

Why is the 38 mm height useful on modern rifle platforms?
It aligns well with the higher combs found on most precision chassis systems, reducing the need for excessive cheek riser adjustment and promoting a natural head position.

How does this mount affect eye relief consistency?
Because the scope is held rigidly in a fixed position relative to the rail, the shooter can maintain consistent eye relief across repeated mounting cycles.

Is this model well suited for heavy, high-magnification optics?
Yes. The 34 mm ring system and stiff one-piece construction provide the structural support needed for large, heavy scopes without inducing tube flex.

How does the QDP system help users who move optics between rifles?
The repeatable cam interface allows the mount to be transferred between Picatinny rails while preserving zero, assuming the rails are machined to standard dimensions.

How does this model compare to fixed Spuhr mounts in terms of rigidity?
The QDP mechanism adds convenience without sacrificing stiffness; once locked, it behaves like a fixed mount in terms of mechanical stability.

Is the QDP-4002 suitable for duty or field rifles?
Yes. The locking levers are protected from accidental release and the mount maintains zero even when removed for transport or maintenance.

How does the mount interact with Picatinny rail tolerances?
The cam-driven clamping system automatically compensates for minor rail width differences, ensuring consistent engagement and clamping pressure.

Does the mount affect barrel or action harmonics?
The rigid one-piece body minimizes vibration and movement of the optic relative to the action, reducing point-of-impact shift due to recoil-induced oscillations.

Can accessories be mounted directly to the QDP-4002?
Yes. Spuhr’s modular interfaces allow devices like red dots, lasers, and bubble levels to be attached to the mount rather than the scope tube.

How does this mount support clip-on optics?
The consistent alignment and moderate height make it ideal for night-vision and thermal clip-ons that require precise collinearity with the main optic.

Why is this model often chosen for tactical precision rifles?
It combines high rigidity, repeatable zero, and quick-detach capability in a configuration that suits modern optics and rifle ergonomics.