Description
This Apex Optic Mount is built for shooters who need their Holosun 509T locked onto a Sig Sauer P320 with the SIG-LOC optic cut. Whether you carry a P320 Legion, M17, M18, or another model with that specific cut, this mount delivers a secure, repeatable zero without adding unnecessary bulk to your slide. Machined from billet steel with a black oxide finish, it’s tough enough for daily carry, range use, and hunting sidearms.
The integrated rear sight is placed in front of the optic, which does two things at once. First, it acts as a gas shield – keeping carbon, debris, and blowback off your optic’s objective lens so you spend less time wiping it clean and more time on target. Second, it saves you the hassle and cost of installing a separate rear sight. The sight is regulated for point-of-aim equal to point-of-impact at 10 yards with 115-grain ammunition, and it co-witnesses in the bottom 25% of the optic window. You’ll need a tall front sight for that co-witness – and it’s included. You can choose between two sight height packages based on your barrel length (see options below).
If you prefer the rear sight behind the optic, that version includes a blast deflector that stays completely out of your optic window – no visual clutter, just a cleaner lens. Both versions securely mount the Holosun 509T to the slide with screws that have a thread-locking patch pre-applied. Torque them to 20 in-lb, and you’re set. The mount also works with M17/M18 models that have the factory loaded chamber indicator – no modification needed.
Key specs and fitment details:
- Designed specifically for Sig Sauer P320 slides with the SIG-LOC optic cut (Legion, M17, M18, and compatible models)
- Machined from billet steel, black oxide finished for corrosion resistance and low glare
- Integrated rear sight (BUIS) placed in front of the optic doubles as a gas shield to keep the objective lens cleaner
- Rear-sight-behind-optic version includes a blast deflector that doesn’t appear in the optic window
- Tall front sight included; select height based on barrel length
- Sights regulated for POA=POI at 10 yards with 115-gr ammo
- Thread-locking patch pre-applied to screws – torque to 20 in-lb
- Price: $135 – includes mount, tall front sight, and screws
If you don’t need backup iron sights, the Apex
Reviews
There are no reviews yet.