[Duncans ProView] 30mm Med Picatinny Scope Mounts 20mm (x2)

These are a pair of good quality medium-profile scope rings (or mounts) made by ProView designed to securely attach a rifle scope with a 30mm main tube diameter to an airgun or firearm equipped with a standard Picatinny or Weaver rail.

The "Medium 30mm Tube" part refers to the rings being sized for modern rifle scopes with a 30mm (about 1.18") main tube (larger and more common today than the older 1"/25.4mm standard).

"Picatinny/Weaver" means they clamp onto the slotted rail system found on most tactical rifles, ARs, and many hunting or air rifles. The "20mm" designation is common terminology (especially in UK/European markets and airgun communities) for the standard Picatinny/Weaver rail width/profile, distinguishing it from narrower 9-11mm dovetail rails.

Features and Specs

These mounts are sold as a pair (two rings)

Construction: CNC-machined from lightweight, strong aircraft-grade aluminum (e.g., 6061-T6 alloy) with a matte black anodized finish for durability and reduced glare.

Height/Profile: "Medium" profile raises the scope's center line higher above the rail (often ~29mm / ~1.14" or more from rail top to tube center). This provides extra clearance for large-objective scopes (50mm+), barrel contours, or iron sights, and is popular on flat-top ARs or rifles needing higher eye relief.

Mounting: Simple clamp-on design with hex/Torx screws (often 4-screw per ring for security) or quick-detach levers on some models. Many include a recoil lug or stop to resist shifting under fire.

Fit: Compatible with all standard Picatinny (MIL-STD-1913) and Weaver rails. Some listings note they also work with 20mm Weaver-style bases.

Extras: Often include protective inserts/tape inside the rings to prevent marring the scope tube, plus tools for installation.

They are precision-machined for a solid hold- Common Uses -Mounting rifle scopes on AR-15s/MSRs, bolt-action rifles, shotguns, or air rifles that have a Picatinny/Weaver rail.

Ideal for hunters, target shooters, or tactical users who need reliable, repeatable optics mounting without permanent modifications to the firearm.

Medium profile is especially useful when your scope has a large bell or when the rifle's rail sits Medium height relative to the bore.

Pros and Cons

Pros: Lightweight, easy to install/remove, affordable, widely available, and sufficient for most non-extreme-recoil applications.

Cons: Lower-end versions may not hold zero as consistently under heavy magnum recoil compared to premium brands (e.g., Burris, Warne, or Vortex). Always use proper torque specs and thread locker.