About the Optic Mount for Aimpoint

This optic mount is purpose-built for shooters who run a Sig Sauer P320 with the Sig-LOC slide cut and want to mount the Aimpoint COA directly, with no adapter plates or shims. It’s designed for practical use—whether that’s range time, competition, or concealed carry—and addresses the specific fitment needs of the Legion, M17, and M18 models (both military and civilian variants).

Machined from a single billet of steel and finished with a black PVD coating, this mount is built to hold zero under hard use. The steel construction is heavier than aluminum, which adds durability and helps the optic resist impact and torque. The mount uses the Aimpoint A-Cut geometry, so the COA seats directly into the mount body with no slack or play. The included clamp secures the optic from the rear, and the entire assembly fits the Sig-LOC cut without requiring modification to your slide.

One specific benefit for M17/M18 owners: this mount works with the factory Loaded Chamber Indicator (LCI). You don’t have to remove or disable that feature to run the Aimpoint COA. That’s a real time-saver if you use the LCI for chamber checks during training or duty use.

Install is straightforward. All screws come with a thread locking patch pre-applied, so you don’t need to mess with liquid thread locker. Torque all Apex screws to 15 in-lb—no guesswork. The kit is 100% made in the USA.

Specs & fitment at a glance:

• Compatible slides: Sig Sauer P320 with Sig-LOC optic cut (including Legion, M17, M18)
• Optic: Aimpoint COA
• Mount material: Billet steel, black PVD finish
• Mounting geometry: Aimpoint A-Cut
• Hardware: Pre-applied thread locking patch, torque to 15 in-lb
• Loaded Chamber Indicator: Compatible with factory LCI on M17/M18
• Origin: 100% made in the USA

Coming soon: Apex COA BUIS Set (sold separately). This add-on replaces the standard clamp with one that has an integrated rear sight, plus an appropriately matched front sight. That gives you a backup iron sight solution without removing the optic mount.

Price: $135 — no hidden fees, no extra