Short answer: an airgun moderator (also called a shroud extension or airgun silencer) is a muzzle device that reduces the report of an air rifle by slowing and dispersing escaping air. To choose one, match the thread to your barrel or shroud (often 1/2x20 UNF, M14x1 or M18x1), pick a bore one caliber size up to avoid clipping, and choose a size for your power level. Laws on these devices vary by location, so check yours first.
Legal note: rules on muzzle devices vary by country, state and city. DonnyFL states that its products are intended for use on airguns only and that you are responsible for knowing and complying with your local laws. This article is general information, not legal advice.
How Airgun Moderators Work
When a PCP fires, high-pressure air follows the pellet out of the barrel. A moderator gives that air chambers to expand and slow down before it exits, which lowers the sound. Many modern PCPs already have baffled shrouds, such as the Karma SLS and AEA SF Series.
DonnyFL Moderators We Carry
| Model | Notes (per product page) |
|---|---|
| RYU | Indexed locking system, QD, includes 1/2x20 female thread adapter, modular length, 30.48mm (1.2 in) diameter |
| YOKOZUNA | Indexed locking, QD, modular, 40.46mm (1.6 in) outer diameter |
| SHOGUN +P .25/.30 | Strengthened for high-power slug PCPs with an extra metal mesh layer, 1.5 in longer than the Sumo |
| EMPEROR +P .457/.50 | Big-bore model with M18x1 endcap |
| RONIN Big Bore | For .357, .457 and .50 caliber, 2 x 6.25 in, M18x1 threaded end cap, mono-core design |
| GREAT KAMI | Built for the .72 cal Zeus, with thicker baffles than the Emperor |
See all DonnyFL moderators and Anti-Venom by Western Airguns.
How to Choose
1. Thread type
Check your rifle. The Karma EQ shroud is threaded 1/2x20 UNF. Other common threads include M14x1 and M18x1. If needed, use an adapter: we stock moderator adapters such as the AEA Challenger Pro M14x1 adapter A100, EDgun M14x1.25 to 1/2x20 adapter A98 and Western Rattler M18x1 adapter.
2. Bore size
DonnyFL recommends ordering one caliber size up to eliminate the chance of pellet clipping.
3. Size vs power
Higher-power rifles push more air, so larger-volume moderators generally suit them. DonnyFL's +P models are reinforced for high-power slug rifles.
4. Alignment
Indexed, QD designs help keep the moderator in the same position for no point-of-impact change. Check alignment after installing. Clipping ruins accuracy and can damage baffles.
Muzzle Brakes Are Different
A muzzle brake redirects air for stability and protects threads, but it is not designed to reduce sound. DonnyFL makes brakes such as the Yokozuna muzzle brake.
Frequently Asked Questions
What is an airgun moderator?
A muzzle device that reduces an air rifle's report by letting escaping air expand and slow before it exits.
Are airgun moderators legal?
It depends on where you live. Rules vary by country, state and city. Check official sources before buying. This is not legal advice.
What thread does my air rifle use?
It varies. The Karma EQ and SLS are 1/2x20 UNF, and others use M14x1 or M18x1. Check your product page or ask us.
Why order one caliber size up?
DonnyFL recommends it to eliminate the chance of the pellet or slug clipping the moderator's internals.
Can a moderator affect accuracy?
A properly aligned moderator shouldn't. Misalignment or clipping will hurt accuracy, so check alignment and re-zero after installing.
Always follow the manufacturer manual, wear eye protection, and know your local laws before buying, carrying or shooting an airgun.
Talk to The Pellet Shop
Have a question about a specific rifle, caliber or setup? Visit our showroom in Westbury, NY, call or text (718) 450-4146, or email info@ThePelletShop.com. You can also browse every airgun we carry online. Specs in this article come from our product pages and manufacturer documentation and can change, so check the current product page before you buy.