AD mount for Holosun 510c

• Quick-detach lever system: The patented QD Auto Lock lever lets the mount come off and go back on a Picatinny rail without proprietary tools, which is useful when swapping optics or removing the sight for transport and maintenance.
• Holosun 510C-specific fit: Built around the Holosun 510C footprint, this mount gives a dedicated interface instead of a generic adapter, helping maintain a secure fit and consistent alignment on the rifle.
• Lower 1/3 co-witness height: With a 7.00 mm build height, this version places the optic higher than a direct low mount, giving a more natural head position on AR-style rifles and leaving iron sights less intrusive in the window.
• 6061-T6 aluminum construction: The aluminum body keeps weight down while still providing the rigidity needed for a hard-use red dot mount that sees repeated installation and removal.
• Made in the USA: American Defense builds this mount in the United States, with a design focused on repeatable attachment and compatibility with a wide range of Picatinny-equipped rifles.

About the AD Red Dot Mounts Series

American Defense AD Red Dot Mounts are a dedicated family of quick-detach mounts for compact sighting systems used on carbines, rifles, and other Picatinny-equipped platforms. Within the company’s lineup, the series covers optic-specific solutions for popular red dot patterns rather than relying on one universal design. That approach gives each mount a footprint and height configuration suited to the optic it is meant to carry.

A defining feature across much of the range is the patented QD Auto Lock lever system, which is designed to fit both in-spec and out-of-spec Picatinny rails and can be adjusted without proprietary tools. Depending on the model, the series is offered with standard, TAC, or titanium levers, allowing the user to balance weight, handling, and locking preference. Height options across the family include low, co-witness, lower 1/3 co-witness, high, and night-vision configurations, so the series can support everything from close-range defensive carbines to more specialized tactical optics setups. The result is a mount line centered on fast removal, repeatable positioning, and platform-specific fit.

About the AD mount for Holosun 510c

The American Defense AD mount for Holosun 510c is a dedicated quick-detach mount made for shooters who want to replace or upgrade the factory mounting arrangement on the Holosun 510C. Its main advantage is not simply that it attaches the sight to a rifle, but that it does so with a repeatable lever-locking system designed for frequent removal and reinstallation on a Picatinny rail. That makes it well suited to rifles that are transported with the optic removed, shared between platforms, or maintained regularly.

This version uses a 7.00 mm height and is intended for a lower 1/3 co-witness setup. In practical use, that places the optic window slightly higher, which often gives a more upright head position and keeps backup iron sights lower in the field of view. On AR-pattern rifles and similar platforms, that can make the sight picture feel less crowded while still preserving access to irons if needed.

The mount body is made from aluminium, keeping the assembly light without giving up the stiffness needed for a stable optic interface. American Defense’s QD Auto Lock lever is designed to accommodate rail variation and can be adjusted without special tools, which matters when moving the mount between different rifles. For users running a Holosun 510C on hunting optics or tactical optics platforms, this mount adds a more robust attachment method with the speed and convenience of a true quick-detach system.

About American Defense

American Defense MFG, LLC is based in New Berlin, Wisconsin and focuses on mounting solutions for optics and firearm accessories across a wide range of firearm platforms. The company states that its mounts and rifles are designed and built in the United States, and its catalog extends from red-dot and scope mounts to magnifier, thermal, night-vision, bipod, tripod, light, and laser mounts. That broad specialization is relevant here because it shows a long-standing focus on the interface between firearm and optic, not just on the optic itself.

A key part of the brand’s identity is its patented QD Auto Lock lever system, used across many of its mounting products. American Defense also manufactures fully ambidextrous AR-15 and AR-10 platform rifles, which reflects the same emphasis on practical handling and modularity seen in its mounts. In the red-dot category, the company is known for optic-specific quick-detach designs that prioritize secure rail engagement, repeatable positioning, and straightforward field adjustment.

Main Features

• Manufacturer: American Defense
• Series: AD Red Dot Mounts
• Made in: USA
• Mount standard: Holosun 510C
• Build height: 7.00 mm
• Material: Aluminium
• Compatibility: Picatinny Rail

Warranty

10 years. American Defense states a 10-year warranty for this mount, providing defined long-term coverage rather than an unspecified warranty term.