The Holosun 509 adapter for Picatinny rail at a lower 1/3 co-witness height (part no. 509MNT-1.63-PIC) secures a Holosun 509-series optic to a Picatinny rail while aligning it with iron sights positioned in the lower third of the sight picture. Holosun builds the mount to the same rugged standard as its Picatinny mount lineup, giving carbine and rifle shooters a co-witness option for backup iron sight alignment. Among lower 1/3 co-witness red dot mounts, this 509 Picatinny mount favors shooters who want iron sights visible below the red dot for a fast backup sight picture.

Key Specifications

• The mount sets a lower 1/3 co-witness height for a Holosun 509-series optic.
• The design aligns the optic with iron sights in the lower third of the sight picture.
• The mount attaches to a standard Picatinny rail for broad rifle compatibility.

Frequently Asked Questions

What does lower 1/3 co-witness mean? The optic sits at a height where iron sights appear in the lower third of the sight picture rather than centered behind the dot.

Which optics does this mount fit? Holosun 509-series optics, mounted to a standard Picatinny rail.

Buy the Holosun 509 Picatinny Mount, 1/3

A co-witness mount height for fast backup iron sight use is exactly what this 509 Picatinny mount delivers. Order it from our Lubbock, Texas gun shop and it ships fast.