Optic Mount for Holosun 509T to S&W Revolvers

This optic mount adapts the Holosun 509T footprint to the top strap of Smith & Wesson K, L, N, and X-Frame revolvers. It replaces the factory adjustable rear sight assembly, providing a stable, direct-mount interface for red dot optics. The primary problem solved is the lack of a dedicated, low-profile mounting solution for 509T-pattern optics on these revolver platforms—eliminating the need for adapter plates or dovetail modifications that introduce height and potential shift under recoil.

Compatibility

• Smith & Wesson K-Frame (models with adjustable rear sight)
• Smith & Wesson L-Frame (models with adjustable rear sight)
• Smith & Wesson N-Frame (models with adjustable rear sight)
• Smith & Wesson X-Frame (models with adjustable rear sight)
• Accepts any optic using the Holosun 509T footprint (including 509T, 509T X2, and compatible third-party optics)

Key Features

• Material: Billet 6061 aluminum, black hardcoat anodized
• Hardware: Heat-treated stainless steel screws, black oxide coated, with factory-applied hi-temp thread locker patch
• Design: Direct replacement for adjustable rear sight assembly; no drilling, tapping, or gunsmith fitting required
• Manufacturing: Machined in-house at Peoria, Arizona
• Weight: Adds minimal mass to the top strap; maintains revolver balance

Install Difficulty

2 out of 5 — Moderate mechanical aptitude required. Tools needed: 3/32″ punch (for rear sight pin removal), small flathead screwdriver or sight adjustment tool, and a 1/16″ hex key (included with most 509T optics). Estimated time: 15–30 minutes. No permanent modification to the revolver.

FAQ

Will this fit a Smith & Wesson Model 686 (L-Frame)?

Yes, provided the revolver is equipped with an adjustable rear sight. This includes most 686, 586, 686 Plus, and similar L-Frame variants. Verify your rear sight is the factory adjustable type before ordering.

Does the mount co-witness with factory iron sights?

No. The mount replaces the rear sight entirely. You will lose the rear iron sight reference. If a co-witness is required, you must install a front sight of appropriate height and use a red dot with a lower 1/3 or absolute co-witness window. This mount is designed for dedicated red dot use.

Can I remove the mount and reinstall the factory rear sight later?

Yes. The installation is non-permanent. The mount uses the same screw holes and pin location as the factory rear sight assembly. Reinstalling the factory sight requires the same tools and procedure.

Shipping & Warranty

Ships from Peoria, Arizona. All mounts and hardware are covered by a limited lifetime warranty against manufacturing defects. Standard lead time is 1–3 business days. No international shipping restrictions on this item.