Optic Mount for Aimpoint COA to SIG P320 Sig-LOC Slide Cut
About this product
Optic Mount for Aimpoint COA to SIG P320 Sig-LOC Slide Cut by Apex Tactical. Fits Sig Sauer.
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The Apex Optic Mount is a direct-fit solution for mounting the Aimpoint COA to any Sig Sauer P320 slide equipped with the factory Sig-LOC optic cut. This includes the full-size P320 Legion series, the M17 and M18 (both military and civilian models), and all other P320 variants using that specific slide interface. The mount also works correctly with the factory Loaded Chamber Indicator on M17/M18 slides, so no modification or removal of that feature is required.
Machined from a single billet of steel and finished with a Black PVD coating, this mount is built to survive the Arizona desert environment. Steel resists the thermal expansion and flex common to aluminum mounts under direct sun exposure, and the PVD finish provides a hard, corrosion-resistant surface that won’t degrade from dust, sweat, or solvent contact. This combination keeps the optic secure during rapid fire, slide manipulation, and holster re-holster cycles.
The mount uses the Aimtech A-Cut geometry to interface with the COA, providing consistent recoil lug engagement. The clamp design applies even clamping force across the optic body, reducing the chance of zero shift from impact or vibration. To simplify installation, all mounting screws come with a pre-applied thread locking patch. Torque all Apex screws to 15 in-lb — no additional thread locker is needed.
Key specifications and fitment:
- Compatible with Sig Sauer P320 models using the Sig-LOC optic cut (Legion, M17, M18, and civilian equivalents)
- Designed for the Aimpoint COA red dot sight only
- Steel billet construction with Black PVD finish
- Preserves factory Loaded Chamber Indicator function on M17/M18 slides
- Screws have pre-applied thread locking patch (torque to 15 in-lb)
- 100% Made in the USA
- Price: $135
Coming soon — Backup iron sight add-on: A separate Apex COA BUIS Set will be available. This kit includes a replacement COA clamp with an integrated rear sight and a matched-height front sight. It mounts using the same footprint and does not require a different optic mount. The BUIS set will be sold separately.
This mount is a direct swap for any P320 with a Sig-LOC cut. No adapter plates, no filing, no shimming. It is designed specifically for the COA — not a universal plate — so the optic sits lower and more securely than a multi-footprint adapter. For shooters running suppressors in high-heat,