Apex Optic Mount Holoson 509T to SIG P320 with SIG-LOC Optic Cut

This Apex Optic Mount is designed to securely mount the Holosun 509T to the slide of the Sig Sauer P320 Legion, P320 M17/M18 and other models featuring the Sig-LOC optic cut. It is machined from a billet of steel and Black Oxide finished.

The fully integrated rear sight in front of the optic acts as a gas shield to keep your optic glass cleaner longer and saves labor from needing to install a rear sight.

The integrated rear sight is setup to co-witness in the bottom 25% of the optic window. Requires a tall front sight for co-witness(Included). Two different sight height packages available. Select option based on barrel length (see below). 

The rear sight behind/after optic versions include a blast deflector that is not visible through the optic.

If you’re looking for this optic mount without backup iron sights, you can find it here: Apex 112-018-PRO. 

Expected Results: 

• Designed to fit the slide of the Sig Sauer P320 with a SIG-LOC optic cut.
• Cleaner optic glass due to the sight/blast deflector between the optic and breech
• Works with the M17/M18 models with the factory Loaded Chamber Indicator 
• Securely mounts the Holosun 509T to the slide
• Thread Locking Patch pre-applied to screws (torque to 20 in-lb) 
• Sights regulated for POA=POI at 10 yds with 115 Gr. Ammunition

Key Feature:

• Both optic mounts include a gas shield, intended to keep your optic Objective Lense cleaner than it would be without the deflector.
  • BUIS in front of the optic: The Base of the BUIS is used as the gas shield.
  • BUIS behind the opic: The block sticking up in front of the optic is the gas shield.