


510C-SPACER
Holosun HS510C Spacer for Lower 1/3 (2026)
Pairs well with
Precision Mounting for Holosun HS510C on Lower 1/3 Co-Witness Platforms
Ensure your Holosun HS510C Solar Red Circle Dot Sight sits at the perfect height on rifles equipped with a Lower 1/3 co-witness iron sight setup. This precision-machined spacer eliminates the need for risky modifications or makeshift shims, providing a secure, stable, and repeatable mounting solution.
Key Features
- Perfect Height Alignment: Specifically designed to raise the optic to the optimal eye-relief and co-witness level for lower 1/3 riser bases.
- Secure Fit: Engineered to eliminate wobble and maintain zero under recoil, ensuring consistent accuracy during rapid fire.
- Durable Construction: Built to withstand the rigors of tactical training and competitive play.
- Easy Installation: No tools or complex adjustments required—simply place between the optic base and the Picatinny rail.
Compatibility
- Compatible with all Holosun HS510C models.
- Designed for use on firearms with a Lower 1/3 co-witness iron sight configuration.
Note: Please verify your iron sight profile and optic model before purchasing to ensure correct fitment.
Complimentary shipping & returns

Holosun HS510C Spacer for Lower 1/3 (2026)
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
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Customer Support
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FAQ’s
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Contact Us
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FAQs
Please read our FAQs page to find out more.
Do I need an account to order?
No, but an account lets you save addresses, review orders, download invoices and manage wish‑lists.
When will my order ship?
We ship in-stock orders twice a week, on Mondays and Wednesdays. Orders placed Monday or Tuesday leave on Wednesday; orders placed Wednesday to Sunday leave the following Monday. Mainland Spain usually receives them 1–2 business days after dispatch. A tracking e-mail follows automatically.
Can I change or cancel my order?
Yes, e-mail info@skirmshop.es or use the contact form before your order’s shipping day (Monday or Wednesday)
with your order number. After dispatch, changes aren’t possible.
Do you ship outside the EU?
Yes, the shipping rates and import taxes will be calculated at checkout.
What is the minimum age to buy an airsoft replica?
Please check your own governments regulations for the minimum required age.
Don't forget to send your ID.
