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Prometheus Rotary Chamber - TDC Top-Down-Center Trolley (For the best Hop, R-Hop, & Flat-hop)


Product Description

The TDC (Top-Down-Centre) Trolley Converter is designed for the Prometheus Hop-up Chamber to radically upgrade the applicable hop-up method inside the chamber.

Full step-by-step installation can be downloaded using this link CLICK HERE TO DOWNLOAD

FAQ Frequently Asked Questions

1. Is this difficult to install?

We recommend that you have some experience with R-hop builds before attempting and please download the instruction/ Installation manual before installing. Consult a gun tech for help if needed or contact us for any help.

2. Do I need an R-HOP patch?

Yes, you do or Flat-hop. There are many brands of R-hop in the market, much like Psionic, and Silent sniper that is easily available in the market as a drop-in patch. Alternatively, there are bucking available from companies like Maple Leaf with their macaroon buckings that perform much like a standard R-HOP does.

3. Should I upgrade my inner barrel?

It's not necessary as stock barrels are pretty good quality these days and could still function well with the R-HOP builds.

4. How do you remove the bracket?

It is possible, but not recommended once it is glued into place to prevent further deviations of the setup in the future. It is possible to still service your hop-up chamber and its components for cleaning without removing the TDC converter bracket.

5. Can it work on another hop-up chamber?

Only for the Prometheus Rotary Chamber am afraid. We have other brackets though for Krytac, Prowin, KWA, ICS, and VFC.

6. What bucking would be the best?

The stock Tokyo Marui ones are good, but other brands like Prometheus and Modify brands have boundless buckings (without the bump inside) which are required for R-HOP builds.

7. Will this work for Flat-hop?

Yes, it will, and for G-hop too. There are plenty of videos of how-to and what you need for this setup. Once you have this in place, you will notice a huge difference in performance and accuracy.

8. How far can R-HOP travel?

For a 1J setup and the right settings, 60-70m using 0.28g BB

Types of Hop the Conversion Kit can be used for

The kit may be used in unison with all bucking types and also works perfectly for R-Hop & Flat-hop setups utilizing a trolley system that applies hop perfectly downwards for the most consistent pressure distributed onto the BB. As a result, increased accuracy over longer distances.

Why TDC (Top-Down-Center)?

The idea of using a Top-down-center is a well sought after functionality in airsoft that maximizes the amount of friction allowed onto a BB round. As a result stable Hop friction and acceleration leading to tighter groupings.

We tested the performance of many types of M-nubs for its firmness, durability, and ability maintain its shape under intense pressure. We settled with a version that ticks all of these boxes. 2x M-nubs are included that covers the length of the hop-up window to maximize the amount of exposure onto the bucking and then BB. This ensures the most stable hop, while the BB accelerates through the hop mound/ Arch. 

Outer Barrel Modification
Please note that this kit will require modification to the outer barrel of your airsoft replica, however, is straightforward. Full instructions on how to modify will be included in the instruction manual to download. The results are worth your while!

The full installation manual provided, please follow all steps to ensure a successful install.

Package Contents

1 x TDC Bracket

1 x TDC Trolley Unit

2x M-Nub

1 x Hop-up Arm

1 x M2 Bolt

1 x M2 Nut

Step by Step Install Guide


Unlocking the Full Potential of the Prometheus Rotary Chamber

The TDC Converter Kit is specifically designed to ensure optimal vertical pressure on the inner barrel window of the Hop-up window.

The kit is specifically engineered to seamlessly integrate the existing hop-up chamber with precision. The bracket effectively guides trolley, allowing the applied pressure to travel in a consistent downward motion without any interruptions in axial movement.

TDC Micro Adjustment

Fine-tune the exact hop-up required for your gun build. The hop applied top to bottom creating the most stable pressure and most exposure onto the BB spin. As a result the most stable and consistent flight path.