Spuhr ISMS QDP-4046 Ø34mm Tube 0 MIL (34 mm High) Quick Detach Picatinny Scope Mount

Spuhr ISMS QDP-4046 34mm Medium (34mm) Quick Detach 0 MOA Cantilever Mount Specifications

Quick detachable mount for AR-style rifles

Rings: 34 mm
Tilt: 0 MIL/MOA
Height: 34 mm/1.35”
Length: 151 mm/5.94” (mount body only)
Weight: 268 g/9.5 oz
Interfaces: 8 sets
EAN: 7340150705138

• 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 the quick-detach interface maintain alignment after repeated installations?
The cam-lock system pulls the mount into the same recoil surfaces on the Picatinny rail each time it is installed. When the levers are adjusted correctly and the same rail slots are used, the mount typically seats in a consistent mechanical position with minimal variation.

How does the monolithic mount design improve long-term optical stability?
Because the rings and base are machined as a single unit, there is no opportunity for independent movement between components. This maintains consistent alignment over time and reduces the chance of gradual zero shift caused by mechanical loosening.

Can improper lever adjustment influence accuracy at extended distances?
Lever tension determines how firmly the mount is drawn into the rail interface, which affects seating consistency. If tension is too low or inconsistent, slight positional changes can occur that become more noticeable at longer ranges.

How does the mount resist forward movement under recoil?
Recoil forces are transferred into the forward faces of the Picatinny slots through precision-machined recoil interfaces. This mechanical engagement works together with clamping friction to prevent gradual forward creep during repeated firing.

Can repeated removal affect the cam-lock consistency?
Normal installation cycles produce minimal wear on the cam surfaces when properly maintained. Keeping the cam mechanism clean helps preserve consistent lever resistance and clamping force.

Does rail material influence mounting performance?
Steel rails generally provide a more durable interface and resist long-term wear from repeated clamping. Aluminum rails perform well but may show contact surface wear after extended use.

How does the mount maintain scope alignment after minor impacts?
The one-piece structure distributes impact forces across the entire mount body rather than concentrating stress at individual rings. This helps preserve ring alignment even after rough handling.

How does ring torque influence long-term scope reliability?
Proper torque distributes pressure evenly around the scope tube and prevents localized stress. Excessive or uneven torque can distort the tube and affect internal component movement.

Can dirt or contamination affect return-to-zero performance?
Debris trapped between the mount and rail can prevent full seating against the recoil surfaces. Cleaning the interface before installation helps maintain repeatable positioning.

How does the mount behave under temperature variation?
The single-piece aluminum construction expands uniformly with temperature changes. This uniform expansion maintains ring alignment and has negligible effect on zero stability.

Can lever tension changes shift the point of impact?
Changing lever tension alters the clamping preload and may slightly change the mount’s seating position. Any significant adjustment should be followed by zero confirmation.

How resistant is the mount to long-term rail wear?
The mount distributes clamping force across a large contact area, reducing localized wear. Proper lever adjustment helps prevent unnecessary deformation of softer rails.

Can the mount be used across multiple rifles effectively?
The mount can be transferred between rifles, but small differences in rail geometry may affect seating position. Zero should always be verified after moving the mount to a different rifle.

How does the mount support consistent long-range shooting?
Stable ring alignment and a rigid rail interface maintain a consistent optical axis relative to the bore. This stability supports predictable ballistic performance at extended distances.

Does removal and reinstallation affect ring alignment?
Ring alignment remains unchanged because the rings are machined into the mount body. Installation cycles do not affect the coaxial relationship between the rings.

How does the mount handle sustained firing sessions?
The mount maintains stable clamping force even as the rifle heats during extended firing. Thermal changes typically have less influence than rail interface consistency.

What installation practices most influence mounting stability?
Consistent ring torque and correct lever adjustment are the most critical factors. Using the same rail slots and maintaining clean contact surfaces also improves repeatability.