The apex optic mount for holosun 509t optic to glock mos pistols bridges the gap between Holosun’s rugged enclosed emitter and Glock’s MOS system. Machined from billet steel in Arizona, this mount locks the 509T directly to your factory MOS slide using the included screws—no adapter plates, no shims, just a rock-solid connection.
| Manufacturer | Apex Tactical Specialties |
|---|---|
| Model | Apex Optic Mount for Holosun 509T to Glock MOS |
| Material | Billet steel (per manufacturer specs) |
| Compatibility | Holosun 509T (all generations) / Glock MOS pistols (G17, G19, G34, G41 MOS) |
| Finish | Black oxide |
| Weight | 0.6 oz (per manufacturer specs) |
| Condition | New |
Key Features
- Direct MOS Fitment — WHY IT MATTERS: No adapter plates or slide milling needed. Drop the mount onto your factory Glock MOS slide, torque the included screws to 15 in-lbs, and you’re zeroed in minutes.
- Billet Steel Construction — WHY IT MATTERS: Steel beats aluminum for shear strength and thermal stability. This mount won’t flex under hard recoil or high-round-count sessions, keeping your 509T’s zero locked.
- Black Oxide Finish — WHY IT MATTERS: Adds corrosion resistance and a low-glare matte surface that won’t reflect into your sight window under bright sun or weapon lights.
- Includes Mounting Screws — WHY IT MATTERS: No hunting for correct thread pitch or length. Apex provides the right fasteners pre-torqued to spec, so install is plug-and-play.
- Made in Arizona, USA — WHY IT MATTERS: Domestic manufacturing means tighter QC and direct support from the engineers who designed it.
Who It’s For
This mount is for shooters who already own a Glock MOS and want to run the Holosun 509T—one of the toughest enclosed red dots on the market—without buying a new slide or sending theirs out for milling. It’s ideal for EDC, competition, and duty use where reliability matters more than saving a few grams.
Pros & Cons
- Pro: Steel construction offers superior durability over aluminum competitors.
- Pro: Direct MOS fit means zero adapter plates or extra parts.
- Pro: Low profile keeps the optic close to the bore axis.
- Con: Steel adds a few tenths of an ounce vs aluminum mounts—negligible for most shooters, but weight weenies may notice.
Comparison
| Feature | Apex (This Mount) | Zev Technologies MOS Adapter | Agency Arms MOS Plate |
|---|---|---|---|
| Material | Billet steel | 7075 aluminum | 6061 aluminum |
| Finish | Black oxide | Type III hard anodize | Black anodize |
| Weight | 0.6 oz | 0.4 oz | 0.5 oz |
| Included Screws | Yes | Yes | No |
| Price | $60 | $75 | $65 |
| Made in USA | Yes (AZ) | Yes (MI) | Yes (CA) |
FAQ
Does this mount require any modification to my Glock MOS slide?
No. The Apex Optic Mount is designed to fit the factory Glock MOS cut without any slide milling, drilling, or permanent modification. Clean the slide surface, apply a drop of blue Loctite to the screws, torque to 15 in-lbs, and mount your 509T.
Will this work with a Holosun 509T X2?
Yes. The mount is compatible with all generations of the Holosun 509T, including the X2 model. The mounting footprint and screw pattern are identical across versions.
Can I use this mount with suppressor-height sights?
Yes. The mount sits low enough that most standard-height suppressor sights will co-witness with the 509T’s window. For absolute co-witness, you may need taller sights—check your specific slide and barrel combo.
What torque spec should I use for the mounting screws?
Per Apex Tactical, torque the included screws to 15 in-lbs. Do not exceed 18 in-lbs to avoid stripping the threads in the mount or slide.
Secure Your Setup Today
Over 40% of competitive shooters now run enclosed emitter optics like the 509T. With the Apex Optic Mount, you get a steel foundation that keeps your dot on target through thousands of rounds. Shop with confidence:
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Browse more Glock Parts And Accessories or check out our full selection of Optic Mounts.
Last updated: April 2026
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