TANDEMKROSS Shadow Mount V3.0 (Ruger Mark Series)

Putting a red dot on a Mark series pistol usually means a rail clamped over the receiver, which stacks height on top of height and puts the dot well above the bore. The Shadow Mount V3.0 skips that step. It fastens to the receiver and the optic bolts to the mount body, which TANDEMKROSS describes as eliminating the need for a Picatinny rail or clamp. The result sits lower and carries less hardware than a rail-plus-plate stack.

Everything needed is in the box: the hardware that attaches the mount to the receiver and the screws that secure the red dot to the mount. Fitment is broad across the family, covering the Mark IV Standard, Tactical, Target, Hunter, and Competition, the Mark IV 22/45, 22/45 LITE, and 22/45 Tactical, the Mark III Standard, Target, and Hunter, the Mark III 22/45, 22/45 LITE, 22/45 Target, and 22/45 Hunter, and Mark I and Mark II pistols that left the factory drilled and tapped. Two exclusions are called out on the page: model 40179, the Silencer Shop exclusive, and vent rib models.

Optic fit is the part to check before ordering. TANDEMKROSS lists support for sights from Vortex, Burris, Trijicon, Swampfox, and Holosun, and publishes a compatibility chart on the product page rather than a footprint spec. Look up the specific optic model on that chart first; brand-level support does not mean every model in a brand's line drops on.