- 7075 Aluminium construction
- For Osight optics
- Compatible with RMR footprints
If you’re looking for a robust, low-profile mounting solution for your micro red dot sight, this mount is built to deliver rock-solid performance without unnecessary bulk. Designed to provide a 1.57-inch optical centre height, it offers a lower 1/3 co-witness with AR-style iron sights, giving you a clean sight picture while keeping your irons readily usable as a backup.
Constructed from 7075 aluminium with a steel-reinforced base, this mount is engineered for strength and durability, even under hard use. Despite its slim and compact profile, it’s impressively rugged, making it a reliable choice for demanding setups. The dual cross-bolt design delivers exceptional clamping force, ensuring a secure and stable attachment to any Picatinny rail.
Compatibility is another strong point. This mount works seamlessly with the Osight X, Osight, and other micro red dot sights that use the RMR / 407C / 507C footprint. Please note that it is not compatible with the Osight S. Overall, this is a dependable, no-nonsense optic mount that balances strength, compactness, and precise sight alignment. It’s an excellent upgrade for anyone looking to securely run a micro red dot while maintaining a practical co-witness with their iron sights.
Fast Delivery
Delivery & Postage
Here at Patrol Base, we send all our packages from our Warehouse based in the UK with the exception of European Warehouse Items. All of our parcels are sent with specially picked couriers to ensure your parcels get to you on time and in one piece.
For more information please check out our Delivery Information Page.
Estimates
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK 3-5 day Standard
£6.95
From
Dispatched with 24hr UK mainland
£8.95
From
Highlands / Islands
£24.99*
From
* Please note that Scottish Highlands, and Islands postage prices can vary wildly. Please refer to the Postage Calculator at the basket for the lowest possible price.
Returns
We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee: if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.
You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
For more information on returning products, and how to do it please visit our Returns Policy Page.
Description
Features
- 1.57-inch optical centre height – Provides lower 1/3 co-witness with AR-style iron sights
- 7075 aluminium construction with steel-reinforced base – Strong, durable, and lightweight
- Dual cross-bolt mounting system – Maximum clamping force on Picatinny rails
- Compact and slim profile – Rugged design without unnecessary bulk
- Wide optic compatibility – Fits Osight X, Olight Osight, and other micro red dots with RMR / 407C / 507C footprint
- Not compatible with Osight S
Package Includes
- Olight OSP-157 RMR Riser Mount
Specification
General
Parts & Accessories Type | Mounts |
|---|---|
External Part Type | Mount, Sight Mount, |
 | |
Construction
 | Aluminium |
|---|
Part Specific
 | 20mm RIS / RAS |
|---|
Mount Specific
Mount Type | Scope Mount |
|---|