Holosun 509 Lower 1/3 Cowitness Picatinny Mount 1.63 Inches - Black - 509MNT-1.63-PIC - UPC: 810047071082
Product Description
The Holosun 509MNT-1.63-PIC is a high-grade riser mount designed specifically for the Holosun HE509T enclosed red dot sight series. Machined to place the optic's reticle center at an exact 1.63-inch optical axis height, this mount achieves a true Lower 1/3 cowitness with standard AR-15 mil-spec iron sights. Elevating the optic slightly above a absolute cowitness sightline provides a clearer, less cluttered field of view through the window while keeping backup iron sights usable in the lower third of the sight picture.
Constructed from lightweight, high-strength 6061-T6 aluminum and treated with a durable black anodized finish, the 509MNT-1.63-PIC is built to withstand high recoil impulses, rapid barrel heating, and rough field handling. The proprietary clamping interface integrates directly into the clamping rail system of the HE509T housing, securing the optic tightly without requiring intermediate adapter plates.
The base clamps directly onto standard MIL-STD-1913 Picatinny rails using a heavy-duty crossbolt lock system. Recoil lugs on the underside prevent movement along rail slots under repeated firing, ensuring lockup and return-to-zero performance for carbines, PCCs, and shotguns.
*Armorer Bench Notes & Real-World Staging Guidance:
Optic & Rail Compatibility Matrix:
• Optic Fitment: Directly compatible with Holosun HE509T (Red/Green Dot) series enclosed optics.
• Rail Interface: Mounts to any standard MIL-STD-1913 Picatinny rail section.
Torque & Staging Steps:
1. Slide the 509MNT-1.63-PIC mount onto your top receiver Picatinny rail, pushing forward toward the muzzle to seat the recoil lug against the rail slot.
2. Torque the base crossbolt to 20-25 in-lbs using a calibrated inch-pound torque wrench.
3. Align the HE509T optic onto the top dovetail section of the mount and tighten the optic's side clamping screw to 15 in-lbs (apply blue medium-strength threadlocker to threads prior to final torquing).
Key Features
- Provides a 1.63-inch optical center height for lower 1/3 cowitness with standard iron sights.
- Direct interface engineered specifically for the Holosun HE509T enclosed optic footprint.
- CNC-machined from 6061-T6 aircraft aluminum for maximum strength-to-weight ratio.
- Hardcoat anodized black finish offers superior scratch and chemical resistance.
- Crossbolt clamping assembly secures solidly to MIL-STD-1913 Picatinny rails.
- Integrated recoil lug prevents optic shifting forward or backward during heavy recoil.
- Skeletal hollow body design keeps total weight low without sacrificing structural rigidity.
Product Specifications
- Brand: Holosun
- MPN / Model: 509MNT-1.63-PIC
- UPC: 810047071082
- Optical Axis Height: 1.63 Inches (Lower 1/3 Cowitness)
- Optic Footprint: Holosun 509 (HE509T)
- Mount Interface: MIL-STD-1913 Picatinny Rail
- Material: 6061-T6 Aluminum
- Finish: Black Anodized
- Mass: ~1.8 oz
