The Brevitas II is our smallest moderator, coming in at 28x70mm and under 25 grams. For reference, that's roughly the size of a fat tube of chapstick. These are not typos. At this size, the design goal was never whisper-quiet performance; it was to produce the most effective sound attenuation physically possible in a package that disappears onto the end of a shrouded rifle.

The design uses Nikola Tesla's Gas Diode to reflex propellant air back on itself, resisting forward flow through geometry alone with no moving parts. Multiple compact gas diode stages are packed into the available length, followed by a damping section that substantially reduces post-peak noise, a meaningful addition at this size. A whoosh on firing is still a consequence of the micro-size form factor, but it's considerably quieter than earlier versions. What the Brevitas II delivers is real peak attenuation in a package that disappears onto the muzzle. Pair it with a shrouded rifle and it takes full advantage of the barrel's unused reflex volume for even better results. If you need more attenuation than that, you need a larger moderator.

The Brevitas II is the successor to the original Brevitas, which was produced in limited numbers before manufacturing constraints forced a pause. The successor solves those manufacturing issues while improving on the original's acoustic performance, squeezing more out of an already extremely constrained form factor.

The Brevitas II is also available in a brake variant. There's still usable propellant air exiting the muzzle at this size, so the brake puts it to work reducing recoil and resisting muzzle climb. The brake face is semicircular rather than flat, which matters more than it sounds like it should: a flat surface only stops the air's forward motion, but a curved surface catches that air and redirects it backward. Reversing the air's direction changes its momentum by roughly twice as much as simply stopping it would, and that larger change is what generates the additional recoil-reducing force. It's the same principle behind a water wheel with curved buckets outperforming one with flat paddles. That tradeoff is worth being upfront about: brakes are inherently noisier than a plain moderator exit, partly because redirecting air is itself a noise-generating process, and partly because that redirected air is sent back toward the shooter instead of forward downrange like a standard moderator's output. The brake variant is meaningfully quieter than a bare brake with no moderator at all, but it is substantially louder than the standard Brevitas II. It's a good compromise for shooters who want both recoil reduction and a real reduction in muzzle report. The brake adds 32mm to overall length and roughly 10 grams to overall weight.

Key Features:

• Tesla Gas Diode design: Multiple compact diode stages reflex and delay propellant air through geometry alone, no moving parts

• Extreme compact form factor: 28x70mm and under 25 grams standard, or 102mm and under 35 grams with the brake variant; same 28mm diameter either way; designed to blend into the shroud profile of a shrouded rifle

• Shroud-friendly design: Performs best paired with a shrouded rifle, using the barrel shroud's reflex volume to extend dwell time and maximize attenuation, but delivers meaningful peak reduction on unshrouded guns too

• .30 caliber bore fits all standard smallbore airguns: Testing showed no performance improvement from smaller bores, so these ship bored for .30 cal and run cleanly from .177 through .30

• Brake variant available: Semicircular brake face captures and reverses propellant air instead of deflecting it, maximizing the momentum change that reduces recoil; air directly adjacent to the flight path is routed radially and evenly around the bore, with rearward/upward diversion only introduced at the brake's perimeter, preventing the asymmetric pressure that causes POI shift or pellet destabilization

• Compact damping section: Rev.2 adds a damping stage after the diode stack, substantially reducing post-peak noise without growing the form factor

• Built and tested in the USA

This product is intended for airgun use only. Use of this product in any manner inconsistent with its design intent is a violation of federal law. More information about the federal court ruling which clarified the legality of airgun moderators in the United States can be found here. Local restrictions may still apply. It is the responsibility of the buyer to ensure compliance with all applicable laws.

This item ships within the United States only.