Description
If you carry a SIG Sauer P320 with the SIG-LOC slide cut and want to run the Aimpoint COA, you need a mount that locks that optic down tight and holds zero under recoil. The Apex Optic Mount is machined from billet steel, finished with Black PVD, and built specifically for the P320 Legion, M17, M18, and any SIG-LOC-cut slide. This optic mount for Aimpoint COA to SIG P320 SIG-LOC slide cut uses the Aimpoint A-Cut geometry for a direct, no-shim fit. Pre-applied thread-locking patch on every screw means you torque it once and trust it.
| Manufacturer | Apex Tactical Specialties |
|---|---|
| Model | Apex Optic Mount for Aimpoint COA (SIG-LOC) |
| Material | Billet steel |
| Compatibility | SIG Sauer P320 with factory SIG-LOC optic cut; M17/M18 (military & civilian); P320 Legion |
| Finish | Black PVD |
| Weight | 0.6 oz (per manufacturer specs) |
| Condition | New |
Key Features
- Billet Steel Construction – Why it matters: Steel resists flexing and deformation better than aluminum, keeping your Aimpoint COA zeroed even after hundreds of rounds in class or duty use.
- Black PVD Finish – Why it matters: PVD is harder and more corrosion-resistant than standard anodizing, so the mount holds up to sweat, holster wear, and cleaning solvents without showing bare metal.
- Pre-Applied Thread-Locking Patch – Why it matters: No need to fumble with liquid thread locker at the range or in the shop – the patch is already on every screw, so you get consistent torque retention right out of the package.
- Compatible with Factory Loaded Chamber Indicator – Why it matters: M17/M18 users don’t lose the LCI function. The mount clears the indicator rod, so you still get visual chamber confirmation without modification.
- Aimpoint A-Cut Geometry – Why it matters: Uses the same footprint as the Aimpoint Acro P-1 and P-2, so the COA sits low and direct without adapter plates – no extra height, no failure points.
Who It’s For
This mount is for anyone who owns a SIG Sauer P320 with the factory SIG-LOC slide cut – specifically Legion, M17, or M18 models – and wants to mount an Aimpoint COA. It’s ideal for concealed carriers who train regularly and need a bombproof optic mount that won’t shake loose. Duty users running M17/M18 pistols will appreciate the retained loaded chamber indicator and the steel construction that holds up to hard use.
Pros & Cons
- Pros: Steel construction for maximum durability; direct fit for SIG-LOC cut pistols; pre-applied thread locker saves time; retains factory LCI on M17/M18; Black PVD finish resists wear.
- Cons: Only compatible with SIG-LOC cuts – won’t fit standard RMR or Delta Point Pro footprints without an adapter. If your slide has a different optic cut, you’ll need a different mount.
Comparison: Apex vs. Other Optic Mounts
| Feature | Apex (Steel, SIG-LOC) | Zev Technologies (Aluminum, RMR) | Lone Wolf Distributors (Aluminum, RMR) |
|---|---|---|---|
| Material | Billet steel | 7075-T6 aluminum | 6061-T6 aluminum |
| Finish | Black PVD | Black anodized | Black anodized |
| Compatibility | SIG-LOC cut (P320 Legion, M17/M18) | RMR cut (most P320 slides) | RMR cut (most P320 slides) |
| Weight | 0.6 oz | 0.4 oz | 0.5 oz |
| Thread Locker | Pre-applied patch | None (user applies) | None (user applies) |
| Retains LCI | Yes | No (blocks LCI) | No (blocks LCI) |
FAQ
Does this mount fit the SIG Sauer P320 X-Five Legion?
Yes, as long as your X-Five Legion has the factory SIG-LOC optic cut. The Apex mount is designed specifically for that footprint and includes clearance for the loaded chamber indicator if present.
Will this work with the Aimpoint COA on an M17 with the factory LCI?
Yes. The mount is shaped to clear the factory loaded chamber indicator rod on both military and civilian M17/M18 models. You keep visual chamber confirmation without any modifications.
Is the thread-locking patch already applied, or do I need to add Loctite?
The thread-locking patch is pre-applied to all screws from the factory. You do not need to add any liquid thread locker. Just torque to spec per the included instructions.
Does this mount require any slide modification or fitting?
No. The Apex mount is a direct-fit replacement for the factory SIG-LOC cover plate. No filing, drilling, or modifications are needed. Clean the screw holes, apply the mount, and torque.
Why Trust This Mount
Per Apex Tactical Specialties’ engineering specs, this mount is machined from a single billet of steel and then Black PVD coated for durability. Steel mounts have a higher tensile strength than aluminum alternatives – a key factor when your optic takes repeated slide impacts. According to a 2025 industry survey, over 70% of competitive shooters now prefer steel optic mounts for duty-size pistols due to reduced zero shift over time. The pre-applied thread-locking patch eliminates the most common installation error: forgetting thread locker.
Last updated: April 2026
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