Holosun HS510C Spacer for lower 1/3 Mount

SKU#510C-SPACER Holosun

In Stock

Holosun HS510C Spacer for lower 1/3 Mount

Name: Holosun HS510C Spacer for lower 1/3 Mount
Brand: Holosun
Price: 19.99 GBP
Availability: InStock

1 in stock

The Holosun HS510C Spacer is a simple add-on that bumps your HS510C red dot up to a lower 1/3 co-witness height. Basically, it lifts the optic slightly so your iron sights sit in the lower part of the window instead of right in the middle, giving you a cleaner sight picture while still keeping backups visible. It installs between the optic and the mount, adds almost no weight, and is made from solid aluminum so it still holds up to recoil and rough use. It’s a cheap, easy upgrade that just helps dial in your setup without changing anything major.

-Nathan (Technical Advisor)

VIEW PRODUCT INFO / SPECS

Whilst we aim to dispatch in-stock items within 1 working day, please be aware that during busy periods dispatch of in-stock items may be delayed by up to 2 working days. Authorised UK Retailer

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Product Information FIND OUT MORE

SPECS

Window Size: 0.58x0.77
Dimension (in): 1.6x0.98x0.95
Weight (oz): 1
Housing Material: 6061 T6 Aluminum
Surface Finish: Anodize

FEATURES

Optimal Height Adjustment: Elevates 510C optics to a lower 1/3 cowitness height (approximately 1.6 inches), facilitating quicker target acquisition and improved sight alignment.

Sturdy Construction: Machined from high-quality aluminum for robustness and resistance to recoil, providing a stable platform that maintains zero under rigorous use.

Easy Installation: The 510C Spacer mounts securely between the 510C optic and the quick-detach (QD) mount, offering straightforward installation without compromising on security.

Enhanced Compatibility: Designed to fit seamlessly with most 510C optics and QD mounts, ensuring compatibility across various firearm platforms and setups.

Precision Engineering: Features precise machining and a secure fit to prevent movement during recoil, ensuring consistent accuracy shot after shot.

WHAT'S IN THE BOX

Holosun HS510C Spacer for lower 1/3 Mount

FREQUENTLY ASKED QUESTION(S)

1. What does this spacer do?
It raises the Holosun HS510C to a lower 1/3 co-witness height for better sight alignment.

2. What is lower 1/3 co-witness?
It means your iron sights sit in the lower third of the optic window instead of directly centered, giving a less cluttered view.

3. How much does it raise the optic?
It lifts the sight to about 1.63 inches above the rail.

4. Is it compatible with all Holosun optics?
It’s specifically made for the HS510C footprint, not universal across all models.

5. Does it affect zero?
No, it doesn’t change your optic’s zero—it only changes height position.

6. What is it made from?
Machined aluminum for strength and recoil resistance.

7. Does it add a lot of weight?
No, it’s extremely light—around 1 oz.

8. Is installation complicated?
Not really—it mounts between the optic and existing QD mount with standard screws.

9. Why choose lower 1/3 instead of absolute co-witness?
Lower 1/3 gives a cleaner view through the optic while still keeping irons as backup reference.

10. What’s the main benefit?
It fine-tunes your optic height for a more comfortable and less cluttered sight picture without changing your whole mounting system.

WARRANTY

Holosun 10 years / product lifetime warranty. Read more here

DELIVERY & RETURNS

Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.

Please Note: Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.

Please Note: DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY - READ MORE: HERE

COURIERS

We use DPD , RoyalMail, TNT and UPS courier services for all our orders whether dispatching to the UK or International. As soon as your order has been dispatched you will receive an email with your unique tracking number. We are unable to add delivery notes to your order regarding safe spaces or neighbour deliveries. If you require this service it can be arranged directly with the courier once the parcel is in their network.

IN-STORE ITEMS

These are items that we have in-stock and will be sent out for delivery as soon as possible. We aim to dispatch all orders within 1-2 working days, but during busy periods dispatch may be delayed by a day or so. If you would like to purchase the item in person then please call ahead to arrange an appointment: 01803 611 895.

PRE-ORDER ITEMS

These are usually items that are going to be out-of-stock for a number of weeks or are in short supply. By purchasing a Pre-Order Item you are in effect paying a deposit for your goods. As soon as the item is back in stock yours will be dispatched within 24 hours where possible. Please see individual product pages for current back-in-stock dates. In rare occasions, these dates can be changed by the manufacturers so we recommend staying in contact with Optics Warehouse depending on the product lead time.

INTERNATIONAL DELIVERY & TAXES

In addition to the above information If your delivery address is outside of the UK you may be subject to import duties and taxes, which are levied once a shipment reaches your country. Any such additional charges for customs clearance must be borne by you. You should note that customs policies vary widely from country to country. Optics Warehouse advises each customer to contact their local customs office for further information if they are in any way unsure of local duties or liabilities. Cross border shipments are subject to opening and inspection by customs authorities which means some packages may be opened and re-sealed.

NEED HELP?

If you require any further assistance, please call us on 01803 611 895 or email sales@opticswarehouse.co.uk

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A NOTE ABOUT DPD SHIPMENTS:

Please be advised that we have now introduced DPD Pins to all DPD orders from Optics Warehouse.
If your shipment is being sent from Optics Warehouse via DPD you will be sent a Pin Code that must be shown to the courier upon delivery.
The pincode is sent VIA email & TEXT message. A valid email address and mobile number must be provided at checkout. Emails will be sent from "Riviera House 3PL" - if you do not receive this email please check your junk or spam folders.
Please note that if you do not display your pin code to the courier driver upon delivery, you will not be able to have your item and you may need to schedule another delivery date to show a valid pin.
Please view the attached slides HERE for further information!

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