Holosun Lower 1/3 Co-Witness Dot Sight Mount with Quick Detatch Attachment

SKU#HSCQD1 Holosun

Holosun Lower 1/3 Co-Witness Dot Sight Mount with Quick Detatch Attachment

Name: Holosun Lower 1/3 Co-Witness Dot Sight Mount with Quick Detatch Attachment
Brand: Holosun
Price: 64.99 GBP
Availability: InStock

2 in stock

The Holosun Lower 1/3 Co-Witness QD Mount is a simple but solid upgrade if you want a reliable way to run your red dot at the right height and still keep backup irons in the picture. It’s built for micro red dots and gives you that lower 1/3 co-witness setup, so your irons sit in the lower part of the window while the dot stays clean and unobstructed up top. The quick detach lever is the real bonus—you can pop the optic on or off fast without tools, and it’ll return to zero when you remount it. Made from tough aluminum with a compact, lightweight design, it’s basically a “fit it once and forget it” mount that keeps your setup flexible without messing up consistency.

-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

WHY BUY FROM US?

PRICE MATCH

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OBSIDIAN REWARDS

Founded in Devon in 2007, Optics Warehouse has grown to become the UK’s largest specialist optics retailer, offering an unrivalled selection of rifle scopes, thermal imagers, night vision, binoculars, red dots, mounting systems and shooting accessories from the world’s leading brands, all backed by competitive pricing, expert advice and outstanding customer service.

Shaun Ellis, Managing Director Long range target shooting and deer stalking.

Product Information FIND OUT MORE

DESCRIPTION

Engineered for tactical efficiency and rapid deployment, the Holosun HSCQD1 Red Dot Sight Mount offers shooters a robust and reliable mounting solution for their optics. Designed specifically for use with Holosun T1 Red Dot Sights, this mount is compatible with Picatinny, M1913, and Weaver rails, making it an ideal fit for a wide range of rifles and shotguns.

Crafted from durable 6061 T6 aluminium, the mount features a hard anodised, corrosion-resistant finish that stands up to the rigours of heavy use in demanding environments. Whether you're on the range or in the field, its rugged construction ensures long-lasting performance and consistent alignment.

One of the standout features is the Quick Detach (QD) lever, allowing you to effortlessly attach or remove your optic without tools. This is particularly useful for shooters who need to switch configurations quickly or store their optics separately from the firearm.

The mount includes a spacer to provide a lower 1/3 co-witness height, enabling effective use of backup iron sights in conjunction with your red dot. This setup delivers a clear and unobstructed sight picture, giving you faster target acquisition and improved shooting confidence.

SPECS

Mounting Method: Quick Detach (QD) lever
Material: 6061 T6 aluminium
Finish: Hard anodised, matte black (corrosion-resistant)
Rail Compatibility:
- Picatinny (MIL-STD-1913)
- Weaver
- M1913
Co-Witness Height: Lower 1/3 co-witness (with included spacer)
Optic Compatibility:
- Holosun T1 Red Dot Sight
- Holosun 503 series
- Holosun 403 series
- Aimpoint T1 footprint and similar micro dot sights
Firearm Compatibility: Rifles and shotguns
Included Accessories:
- 1x Co-witness spacer
- 4x Installation screws
- 1x Allen wrench
Dimensions:
- Length: 48mm
- Width: 27mm
- Height: 30mm
Colour: Black

FEATURES

6061 T6 aluminium construction for strength and durability
Hard anodised black finish for enhanced corrosion resistance
Quick Detach lever for fast, tool-free mounting
Lower 1/3 co-witness compatibility with Holosun 503 and 403 series optics
Spacer, four installation screws, and Allen wrench included

WHAT'S IN THE BOX

Holosun Lower 1/3 Co-Witness Dot Sight Mount with Quick Detatch Attachment
1x Co-witness spacer
4x Installation screws
1x Allen wrench

FREQUENTLY ASKED QUESTION(S)

1. What does lower 1/3 co-witness mean?
It means your iron sights sit in the bottom third of the optic window, while the red dot stays above them for a less cluttered view.

2. What is a QD mount?
QD stands for Quick Detach—it lets you attach or remove the optic without tools in seconds.

3. Will it keep zero after removing it?
Yes, good QD mounts are designed to return to the same position with consistent zero when reattached.

4. What optics does it fit?
It’s made for Aimpoint Micro-style footprints, which includes many Holosun micro red dots.

5. What rail does it use?
It attaches to standard Picatinny (MIL-STD-1913) and similar rails.

6. What material is it made from?
Typically 6061-T6 aluminum with a hard anodized finish for durability and corrosion resistance.

7. Does it need tools to install?
No, the QD lever system is designed for tool-free mounting and removal.

8. Why use lower 1/3 instead of absolute co-witness?
It gives a cleaner sight picture since the irons sit lower in the window instead of blocking the center view.

9. Is it heavy?
No, it’s designed to be lightweight while still strong enough for recoil and hard use.

10. What’s the main benefit of this mount?
It makes swapping or removing your optic quick and easy while keeping your setup consistent, properly aligned, and compatible with backup iron sights.

WARRANTY

Holosun 10 year warranty. Click here for more info

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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