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

Description

Designed specifically for the coastal Florida lifestyle, this Optic Mount from Apex solves a persistent problem: securely mounting your Aimpoint COA to a SIG P320 equipped with the Sig-LOC slide cut. Whether you’re carrying on a humid morning walk along the beach or running drills at the range in salt-spray air, corrosion resistance matters. That’s why this mount and its clamp are machined from a solid billet of steel and finished with a Black PVD coating — a finish proven to stand up to moisture, sweat, and the harsh coastal environment without rusting or flaking.

This mount uses the Aimpoint A-Cut geometry, so your COA sits low and solid on the slide. It’s built for the Sig Sauer P320 Legion, M17, M18 (both military and commercial models), and any P320 with the factory Sig-LOC optic cut. If your slide has that cut, this mount drops in and locks up tight. For M17/M18 owners, it’s designed to work with the factory Loaded Chamber Indicator — no modification or removal needed.

Installation is straightforward, but precision matters. All screws come with a thread-locking patch pre-applied, so you don’t have to mess with liquid thread locker. Torque every Apex screw to 15 in-lb, and you’re set. The result is a rock-solid mount that keeps your optic zeroed through holster draws, range sessions, and everyday carry.

Key benefits and specs:

• 100% Made in the USA — machined and assembled domestically with quality control you can count on.
• Steel billet construction with Black PVD finish — built for Florida’s humidity and salt air, not just range use.
• Fits Sig Sauer P320 with Sig-LOC optic cut — Legion, M17/M18 (military and civilian), and other models with that cut.
• Works with factory Loaded Chamber Indicator — no filing, no workarounds.
• Thread-locking patch pre-applied — saves time and ensures consistent torque.
• Torque spec: 15 in-lb for all Apex screws — simple, repeatable installation.

For those who want a complete co-witness setup, Apex is developing a Backup Iron Sight (BUIS) set that will be sold separately. It includes a replacement COA clamp with an integrated rear sight and a matching-height front sight. That option is coming soon — check back or ask us in-store for availability.

At Sunshine Gun Shop, we carry gear that works when it matters.