DonnyFL RYU Sound Moderator 133x31mm 1/2 UNF 6.35mm (.25)

The Ryu moderator from DonnyFL is a slim, lightweight and exceptionally quiet suppressor designed for shooters who prefer a refined, streamlined profile.

DonnyFL’s Quick Disconnect (QD) moderators are engineered for shooters who want speed, precision and repeatability.

Built around a fast‑release mounting system, these moderators lock into place with absolute consistency, ensuring your point of impact remains unchanged even after repeated removal and reattachment.

Each QD model is caliber‑specific and machined from high‑grade aluminum, giving you a durable, modular suppressor that adapts easily to different setups.

RYU: Symbolism and Design

In Japanese mythology, koi carp symbolize samurai‑like determination, swimming upstream and fighting their way up powerful waterfalls.

Those that succeed are said to transform into dragons, representing strength, resilience and evolution.

RYU, the Japanese word for dragon, is inspired by this legendary transformation.

With a diameter of 30.48 mm, the RYU is our robust, evolved interpretation of the KOI.

The Ryu offers broad versatility while maintaining excellent sound performance across the range.

Its internal baffle structure is engineered to smooth airflow and reduce turbulence, resulting in a clean and noticeably softer report from your air rifle.

Unlike bulkier moderators, the Ryu focuses on efficiency through precision‑cut internals rather than large expansion chambers, delivering impressive suppression in a compact form.

The rear cap features a 1/2 x 20 UNF thread, ensuring a secure fit and easy installation on most standard air rifle barrels.

Its slim cylindrical body provides excellent balance on the rifle, making it ideal for shooters who want effective sound reduction without adding unnecessary bulk.

Why Choose DonnyFL?

Precision engineering: All components are CNC‑machined with strict tolerances for consistent, repeatable performance.

Advanced design: Internal flow paths are optimized to reduce turbulence and improve sound suppression.

High durability: Manufactured from premium materials with robust finishes for long‑term reliability.

Trusted brand: Known for dependable products, excellent quality control and strong customer support.

Streamlined internal design

Features a precision‑cut baffle system designed for smooth airflow and consistent suppression.

Rear cap 

Equipped with a 1/2 x 20 UNF threaded rear cap for secure and simple installation.

Slim, lightweight construction

The Ryu’s narrow profile keeps weight low and maintains excellent handling on the rifle.

Compact dimensions 

Designed to offer effective suppression without unnecessary length or diameter.

Caliber

6.35mm (.25)

What is an Air Gun Moderator

An air rifle moderator is a device attached to the muzzle to reduce noise by redirecting and slowing the escaping air. Unlike firearm suppressors, which are heavily regulated and designed to silence combustion gases, airgun moderators simply moderate sound and are specifically engineered for pneumatic systems.

Do Moderators Affect the Accuracy of the Air Gun?

Moderators do not reduce accuracy; in many cases, they improve it by stabilizing airflow and reducing recoil movement. Their weight is minimal and does not negatively affect handling. Heavier rifles also tend to be easier to shoot accurately.

For shooters looking to improve comfort, reduce noise and enhance overall shooting experience, a moderator like the Ryu is an excellent choice.

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