Optic Mount for Aimpoint COA to SIG P320 Sig-LOC Slide Cut

The Apex Optic Mount is a direct-fit mounting solution built to attach the Aimpoint COA red dot to any Sig Sauer P320 slide that uses the factory Sig-LOC optic cut. This includes the P320 Legion series, the M17, M18 (both military and civilian versions), and all other P320 models with the Sig-LOC interface. If your slide has that cut, this mount is a drop-in, no-adapter-needed install.

Built to last, priced to move. This mount and its clamping system are machined from a solid billet of steel, then finished with a Black PVD coating. That means it resists holster wear, corrosion, and the kind of abuse a range gun or duty sidearm sees over thousands of rounds. You pay once, and it stays put. No plastic, no compromises.

Key specs and fitment details:

• Optic compatibility: Uses the Aimpoint A-Cut geometry. Designed exclusively for the Aimpoint COA. No shims, no filler plates required.
• Firearm compatibility: Fits Sig Sauer P320 pistols with a factory Sig-LOC optic cut. Verified to work with M17 and M18 models that retain the factory Loaded Chamber Indicator (LCI).
• Material: Steel billet. Black PVD finish.
• Installation: All screws come with a pre-applied thread locking patch. Torque all Apex mount screws to 15 in-lb. No additional thread locker needed.
• Origin: 100% Made in the USA.
• Price: $135.00

What you get in the box: The Apex Optic Mount, the steel clamp, and all prepped mounting screws. That’s it. No extras to buy, no filler parts you’ll toss in a drawer. The thread locking patch is already on the screws, so you can torque them to spec and get back to shooting.

Coming soon – backup irons: For shooters who want a co-witness setup, Apex will release a COA BUIS Set. This add-on replaces the standard COA clamp with a version that has an integrated rear sight, paired with a matching-height front sight. It will be sold separately. If you want irons later, the mount is ready for it.

Bottom line for the bulk buyer and the budget-conscious shooter: This mount is a one-and-done part. It uses a proven steel construction, a straightforward install, and