RPM 35mm Low Rail Cap Diving Board - Black
The RPM 35mm Low Rail Cap Diving Board is a rail-mounted accessory platform designed to extend your shooting setup without replacing your existing optic mounting hardware. If you run a magnified rifle scope and want to add a secondary red dot sight, laser rangefinder, or other rail-mounted device, this diving board cap gives you a compact, lightweight way to do it. It works with all RPM CLR series rings and Bravo/Delta cantilever mounts, making it a straightforward upgrade for shooters already invested in RPM's mounting ecosystem.
The core idea is elegant: instead of swapping out your entire scope ring or cantilever, you simply replace the existing rail cap with this diving board. The cap provides a 35mm Picatinny rail surface mounted slightly forward and away from your primary optic, creating space for a second sighting system without interference. Whether you're building a hunting rifle with a primary long-range scope and a close-quarters backup, or a range gun with a laser rangefinder mounted parallel to your magnified optic, this accessory keeps your setup modular and ballistically independent.
Installation is straightforward—the original screws from your RPM product are all you need. No special tools, no modification to rings or cantilevers, and no permanent changes to your rifle. If your shooting needs change, remove the diving board and reinstall your standard cap in minutes. For shooters who prefer to keep things simple but want the flexibility to add capability down the road, RPM's approach to compact, compatible accessories means less rework and more time on task.
Key Features
- Designed to add a secondary rail-mounted optic or accessory to your primary magnified scope setup
- Compatible with all RPM CLR series rings and Bravo/Delta cantilever mounts
- Simple cap-replacement design—uses existing hardware from your RPM mount
- Compact and lightweight construction
- Picatinny rail surface for flexible accessory mounting
Specifications
| Rail Size | 35mm Picatinny |
| Finish | Black |
| Manufacturer | Ruff's Precision Manufacturing (RPM Mounts) |
| Compatible Mounts | All RPM CLR series rings; Bravo and Delta cantilevers |
Frequently Asked Questions
Will this diving board work with my current RPM scope rings?
Yes. The diving board is designed to fit all RPM CLR series rings and Bravo/Delta cantilever mounts as a direct cap replacement. If you're already running RPM hardware, no additional adapters are needed.
What screws do I need to install the diving board?
The cap screws that came with your original RPM product are the exact screws needed for installation. You don't need to buy or source additional hardware.
What kind of secondary optics or accessories can I mount?
The diving board features a 35mm Picatinny rail, so you can mount any rail-compatible accessory rated for that size—including red dot sights, laser rangefinders, or other rail-mounted devices. Exact compatibility depends on the dimensions of your chosen accessory and your primary optic configuration.
Can I remove and reinstall the diving board easily?
Yes. It's a simple cap swap using your existing screws, so you can remove it and reinstall your standard rail cap whenever your needs change, with no permanent modifications to your mount or rifle.

