American Defense Mfg. Holosun 509T QR Lower 1/3 Mount – Quick-Release Optic Mount

The American Defense Mfg. Holosun 509T QR Lower 1/3 Mount is a quick-release mount engineered specifically for the Holosun 509T enclosed reflex sight. It positions the optic at lower 1/3 co-witness height, allowing shooters to use backup iron sights through the lower third of the optic window while maintaining a natural cheek weld on AR-15 platforms. The patented QR Auto-Lock lever system provides tool-free attachment and removal with consistent return to zero.

Machined from 6061-T6 aluminum with a hard-anodized finish, this mount is built for durability and repeated use. The lower 1/3 height works well for shooters who prefer a slightly elevated optic position without completely obscuring iron sights. Compatible with any Picatinny or MIL-STD-1913 rail system.

• Type: Quick-Release Optic Mount
• Compatible Optic: Holosun 509T
• Height: Lower 1/3 Co-Witness
• Material: 6061-T6 Aluminum, Hard Anodized
• Attachment: QR Auto-Lock Lever (Tool-Free)
• Rail Compatibility: Picatinny/MIL-STD-1913
• Use: AR-15, Modern Sporting Rifles, Tactical Carbines