Ember 17, 22 and 25

The Ember: Embodies patience and hope

The Ember, its namesake is the quiet heart that nurtures the flame. Compact at 35 mm x 106 mm, it is built for hunters who need serious sound reduction without carrying unnecessary length or weight. Shockingly quiet for its size, accurate, and efficient, the Ember delivers the controlled performance expected from Evolution Moderators™ in a field-ready package. It is small, steady, and capable, holding its strength close and proving itself when the shot matters.

Threads: M10 x 1, 1/2 x 28 UNF, 1/2 x 20 UNF, M14 x 1, M14 x 1.25, M16 x 1, M18 x 1, M19 x 1.5, M20x1, M20x2 and Airsoft. Also EZLOK inserts are now supported. EZM10, EZHAF (l1/2 UNF) and EZM14. This is going to generate questions about where to get the inserts and how to use them. I will create a PDF for DL to answer those questions.

PLEASE rate it. Give back to the other users of this site the information they need to make a decision.

Theory of Operation

Evolution Moderators™ are airgun moderators designed computationally, selected competitively, and kept only if they perform. They are not copied from conventional layouts or tuned by guesswork. Each design was developed through a genetic algorithm written with AI assistance to simulate candidate geometries using two-dimensional computational fluid dynamics. The models offered here were selected from a population of roughly 35 million design candidates. Additional experimental designs, not listed here, have been extracted from populations as large as 50 million candidates.

The purpose is not simply to make the largest possible moderator or chase a single number on a sound meter. The purpose is practical quiet: reduced sharpness, lower peak energy, controlled release of pressure, and accuracy you can count on. If a design does not preserve accuracy, it does not make the catalog.

The stack inside an Evolution Moderator™ does three basic things. It gives the muzzle blast room to expand, redirects the pressure wave away from the pellet’s flight path, and delays the release of that pressure so the shot is less abrupt. Circumferentially vented frustums—cone-shaped baffles—divert the high-pressure puff outward, down the sides of the baffles, and through vents that fragment the pressure wave. That process creates controlled turbulence near the inside wall of the moderator tube while helping strip disturbed airflow away from the base of the pellet.

As the pressure front moves through the stack, it encounters anechoic structures protruding from the tube wall into the outer airflow path. These structures further disturb and slow the pressure wave along the sides of the tube. When the wave reaches the next frustum, part of it reflects from the cone surface, creating a localized high-pressure region that resists continued forward movement. The following chamber then behaves much like a passive flow-restricting diode: as chamber pressure rises, back pressure builds and slows the advancing pressure front.

That delay spreads the muzzle blast over a longer period of time instead of allowing it to exit as a short, sharp impulse. The result is less peak acoustic energy and less of the hard, high-frequency crack that tends to make a shot stand out, especially in the roughly 3 kHz to 12 kHz range. At the same time, the design helps manage energy in the 300 Hz to 3 kHz audio band, producing a smoother, less abrupt report.

Each model in the line has a role. The lil’ Spook is small, light, and quiet for its size. The Ember is the compact hunter’s model. The Standard is the go-to benchmark. The Ideal is sized to compare fairly against the market average. The Wraith is quiet and unobtrusive. The Krait is compact, efficient, and more capable than its size suggests. For larger airguns, the Gille, Coyote, and Stealth extend the same design philosophy into big-bore territory, where higher air volume and heavier projectiles demand more control, more capacity, and more disciplined pressure management.

Test Evolution Moderators™ beside your favorites. Just make the comparison fair. Match caliber to caliber, and compare moderators of similar volume rather than judging by length or diameter alone. Then decide for yourself.

Notice: There is a number associated with every model and caliber.  It is caliber and model specific. It takes the form YYMMDDHHMM.NNN.  Year, Month, Day, Hours, Minutes. Fitness.  It is printed on the device itself.  You can look at the stl to get that number. This tells you when the moderator came out of the GA and was created in OpenSCAD.  It also gives you the fitness value the GA assigned to it.  The larger the fitness value, the better the device performed in simulations. Fitness score is not a cross-family measured-performance score. It is a search objective that is useful inside a constrained design family, but it does not rank all moderator families against one another in real-world acoustic output. Date is more important than fitness.

White Paper and Technical Details

Today (2026-08-19) I am updating the designs which accept EzLok inserts.  These are a steel insert which is threaded on the outside and inside.  They can be threaded into the attachment end of a printed moderator to add steel threads.  There are videos on the vendor's site which explain the use of them. 

https://www.ezlok.com/videos

The part numbers you want are:

E-Z LOK 319-820 for a 1/2x20; TAP is 5/8 x 11

E-Z LOK 329-1412 for an M14x1.25; TAP is 3/4 x 16

E-Z LOK 329-1008 for an M10x1; TAP is 9/16 x 18