Holosun HS510C Lower 1/3 Co-Witness Spacer – Mount Riser for HS510C Open Reflex (510C-SPACER)

Model/SKU: 510C-SPACER • Alt. SKU: 510CSPACER • UPC: 605930624960
Compatibility: Holosun HS510C open reflex sights (and HS510C variants) • Interface: MIL-STD-1913 Picatinny (with your HS510C mount) • Height: Raises optic to lower 1/3 co-witness with AR-height iron sights • Material/Finish: Precision-machined aluminum, black hard-anodized • Hardware: Mounting screws included

Optimize your sight picture and posture with the Holosun HS510C Lower 1/3 Co-Witness Spacer (510C-SPACER). Purpose-built for the HS510C open reflex sight, this lightweight riser lifts your optic to lower 1/3 co-witness—ideal for AR-pattern rifles and any setup running backup irons. The extra height supports a more heads-up shooting posture, clears gas blocks and folding sights, and keeps the window free of clutter while still allowing you to reference irons through the lower third when needed. Machined from rigid aluminum and finished in black hard anodize, the spacer locks up solidly to your factory HS510C mount for a return-to-zero you can trust.

Why Choose the HS510C Lower 1/3 Spacer

• Faster target acquisition: A slightly taller optic promotes a natural, upright cheek weld—less neck strain, quicker dot pickup, and improved peripheral awareness.

• Clean co-witness: Maintains a lower 1/3 view of AR-height irons—out of your primary sightline until you need them.

• Rugged & light: CNC-machined aluminum adds minimal weight while delivering repeatable, rock-solid clamping.

• Factory-fit reliability: Designed specifically for the HS510C footprint and mount, ensuring proper alignment and screw length.

• Duty-ready finish: Black hard-anodized surface resists corrosion, solvents, and hard use.

Key Features at a Glance

• Purpose: Raise HS510C to lower 1/3 co-witness height

• Fit: HS510C open reflex sight (and compatible variants) on Picatinny rails

• Construction: Aluminum, precision machined; black hard-anodized

• Hardware: Includes correct-length screws for secure installation

• Use Cases: AR-15/AR-10 carbines, duty rifles, PCCs, and builds with BUIS or tall front posts

• Model / UPC: 510C-SPACER / 605930624960

Performance Benefits

• Heads-up ergonomics: Better posture for plate carriers, ear pro, and gas masks/visors.

• Clearer window: Irons sit low in the optic window—unobstructed dot for speed shooting.

• Versatility: Ideal for night-vision/thermal bridges and riser stacks that need consistent sight height.

Installation (Quick Guide)

1. Unload & clear the firearm.

2. Remove the HS510C from its mount; place the spacer between optic and factory base.

3. Align holes and install the included screws; tighten in a cross pattern.

4. Torque to spec (follow Holosun’s recommendations); verify no daylight at the interfaces.

5. Re-zero your optic after installation.

Note: This is a spacer only. HS510C optic and factory mount are sold separately. Always use the supplied screws to ensure proper thread engagement.

Specifications (Summary)

• Brand: Holosun

• Product: HS510C Lower 1/3 Spacer

• SKU(s): 510C-SPACER / 510CSPACER

• UPC: 605930624960

• Material: Aluminum, black hard-anodized

• Interface: Works with HS510C factory mount on Picatinny rails

• Function: Raises optic to lower 1/3 co-witness height

• Included: Spacer block and mounting screws

SEO Highlights (What Shoppers Search)

• Holosun 510C spacer lower 1/3

• 510C-SPACER 605930624960 riser for HS510C

• Holosun HS510C Picatinny co-witness mount

• Lower 1/3 cowitness spacer aluminum anodized

• Holosun 510C red dot height raiser

Meta Title (SEO)

Holosun HS510C Lower 1/3 Co-Witness Spacer – Picatinny Riser, Aluminum, Black | 510C-SPACER | UPC 605930624960

Meta Description (SEO)

Achieve a lower 1/3 co-witness with your Holosun HS510C. The 510C-SPACER installs between the optic and mount to deliver a heads-up posture, clear window, and dependable alignment. Aluminum, black hard-anodized. UPC 605930624960.

Structured Data (JSON-LD)

json
Copy code
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Holosun HS510C Lower 1/3 Co-Witness Spacer",
  "sku": "510C-SPACER",
  "gtin12": "605930624960",
  "brand": { "@type": "Brand", "name": "Holosun" },
  "category": "SportingGoods",
  "description": "Aluminum spacer that raises the Holosun HS510C open reflex sight to a lower 1/3 co-witness height on Picatinny rails. Includes mounting screws and features a black hard-anodized finish.",
  "material": "Aluminum",
  "color": "Black",
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "Compatibility", "value": "Holosun HS510C and variants" },
    { "@type": "PropertyValue", "name": "Interface", "value": "Picatinny (with factory HS510C mount)" },
    { "@type": "PropertyValue", "name": "Height", "value": "Lower 1/3 co-witness" }
  ],
  "itemCondition": "https://schema.org/NewCondition"
}

**Get the ergonomic advantage and a cleaner sight picture—**the Holosun HS510C Lower 1/3 Spacer (510C-SPACER) is the simple, secure way to dial in your optic height for speed and comfort. The End