Spuhr ISMS QDP-3616 Ø30mm Tube 6 MIL (34 mm High) Cantilever Quick Detach Picatinny Scope Mount

Spuhr ISMS QDP-3616 30mm High (38mm) Quick Detach 20 MOA Picatinny Mount Specifications

Picatinny mount for use on AR10 rifles

Rings: 30 mm
Tilt: 6 MIL/20.6 MOA
Height: 38 mm/1.5”
Length: 151 mm/5.94” (mount body only)
Weight: 270 g/9.5 oz
Interfaces: 8 sets
EAN: 7340150705046

• 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 built-in MOA/MIL affect scope adjustment range in practical use?
The integrated cant shifts the optical axis downward relative to the bore, allowing more upward elevation travel to remain available for long-distance shooting. This helps keep turret adjustments closer to the center of the scope’s mechanical range where tracking tends to be most consistent.

Does the cantilever angle influence return-to-zero performance?
The presence of cant does not affect the mechanical interface between the mount and rail. Return-to-zero consistency depends primarily on rail engagement and lever tension rather than the angle of the mount.

Can the cant create limitations when zeroing at shorter distances?
In some configurations, the angled geometry may require additional downward turret adjustment to achieve a close-range zero. Most modern scopes have sufficient adjustment range to accommodate this without difficulty.

Does MOA/MIL introduce additional stress on the scope tube?
The angled base does not introduce additional mechanical stress because the rings remain coaxially aligned. The scope tube experiences the same clamping forces as it would in a flat mount.

Does cant improve long-range dialing consistency?
Using less extreme turret positions helps maintain consistent internal spring pressure on the erector assembly. This can reduce tracking variation during repeated elevation adjustments.

How does cant interact with zero-stop turret systems?
The zero stop will be positioned further from the mechanical bottom of the scope’s adjustment range. This allows more available elevation travel above the zero stop for long-distance shooting.

Can cant influence scope durability over time?
Operating closer to the center of the adjustment range reduces stress on internal springs and mechanical components. This may contribute to more consistent long-term performance.

Does the QD interface behave differently on a canted mount?
The quick-detach mechanism functions identically to a non-canted version. Lever tension and rail engagement remain the primary factors affecting stability.

Can the mount be used effectively for both mid-range and long-range shooting?
A properly zeroed MOA/MIL mount works normally at intermediate distances. The primary advantage becomes apparent when dialing for extended ranges.

Does cant reduce available downward adjustment?
Some downward adjustment is sacrificed in exchange for increased upward travel. This trade-off is typically acceptable for rifles intended for extended-range use.

Can mount MOA/MIL influence tracking tests or tall-target tests?
Tracking tests remain valid because they measure turret movement relative to the reticle. The mount angle does not change the mechanical relationship between adjustments and reticle movement.