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

This steel optic mount adapts the Aimpoint COA to any SIG Sauer P320 slide with the factory Sig-LOC cut. It replaces the need for aftermarket slide milling or adapter plates, locking the COA directly into the slide’s integral interface using the Aimpoint A-Cut geometry. The result is a lower, more repeatable optic-to-bore axis with no shifting under recoil.

Compatibility

• SIG Sauer P320 Legion (all variants with Sig-LOC cut)
• SIG Sauer M17 / M18 (military and civilian models)
• P320 slides with factory Sig-LOC optic cut
• Works with factory Loaded Chamber Indicator on M17/M18
• Does NOT fit P320 slides without Sig-LOC cut

Key Features

• Machined from billet steel, Black PVD finish
• Uses Aimpoint A-Cut geometry for direct COA interface
• Thread locking patch pre-applied to all screws
• Torque specification: 15 in-lb (all Apex screws)
• 100% Made in the USA
• Backup iron sight add-on (COA BUIS Set) available separately – includes replacement clamp with integrated rear sight + matched front sight

Install Difficulty: 3/5

Moderate. Requires removal of factory optic cover plate (if present), mounting the clamp to the COA, then securing the assembly to the slide. Tools needed: T10 Torx driver, inch-pound torque wrench (recommended). Thread locker is pre-applied – do not add extra.

FAQ

Will this mount work with a P320 slide that has a standard RMR cut?

No. This mount is specifically designed for slides with the Sig-LOC optic cut only. It will not interface with RMR, DPP, or other footprint patterns.

Can I use factory SIG suppressor-height sights with this mount?

Factory irons may co-witness depending on slide generation. For a guaranteed lower 1/3 co-witness, use the optional Apex COA BUIS Set (sold separately).

Does the mount interfere with the M17/M18 loaded chamber indicator?

No. The mount is designed to clear the factory LCI on M17/M18 slides. No modification to the indicator is required.

Ships within 1-2 business days. This product carries a limited lifetime warranty against defects in material and workmanship. Warranty does not cover improper installation or use of non-specified torque values.