Secret Menu
Congratulations, you've found our secret menu. Here you can find products which don't fit in, are oddball, we can't produce in large volume, don't have the level of polish we expect from our standard line of products, are experimental, are pet projects, etc. Keep an eye on this space as we don't advertise it, and you never know what you'll find here, but don't forget this page exists for you: our loyal fans and customers.
Falx - Custom Big Bore Core - Experimental
Falx - Custom Big Bore Core - Experimental
The Falx carries a dimensional envelope of 40x170mm, ~180 grams, with a semi-modular serviceable aluminum-tube design. The same proven principles of air stripping, flow delaying, and sound absorption remain but now in an even more advanced form. This brings improved manufacturability, reducing price as compared to previous all-carbon designs, as well as upgradeability, allowing cores to be replaced as the technology advances.
The basic premise of the design is to use Nikola Tesla’s Gas Diode to reflex air back on itself and stop forward flow in the moderator. The moderator uses a three stage system. First the air is stripped off the pellet, reducing turbulence and improving accuracy. Second it is delayed via compound gas diodes. Finally a damping system muffles the sound. Most moderator designs focus on one of two capabilities, either sound wave damping or flow delaying, and this is copied the entire length of the moderator. Why though should the sound and flow at the back of the moderator be the same as at the front? It didn't make sense to us either, thus the design adapts along its length to maximize sound attenuation at a given flow level while minimizing size and weight.
The move to an anodized aluminum tube brings the advantages of serviceability/modularity. Mass varies by core, but is typically around 180 grams. Optional POM/delrin (polymer) end caps shave 22g, bringing the mass down to ~160 grams. Cores can be changed, and while this sounds small, from a development perspective it is a big deal. Previously, to test a new core design, an entirely new moderator had to be constructed. Now cores can be swapped, or even sections of the core as they too have been designed in a modular fashion. This speeds iteration and development substantially, and has lead to several key technological advances, with more to come. This design also sports a tapered bore, improving sound attenuation while reducing the likelihood of clipping. For you, the end line user, this means not only is the Falx is exceptionally quiet, it can be further improved with periodic upgrades as the technology advances.
This listing is for our experimental big bore versions of the stock Falx core, they use the same design as our well tested cores but the bores are increased to fit larger caliber rifles. They are all made to order so take additional time to ship.
This product is intended for AIRGUN USE ONLY. It is a violation of federal law to use this product in a manner inconsistent with its design intent. More information about the federal court ruling which clarified the legality of airgun moderators within the United States can be found HERE. Local restrictions may still apply. It is the responsibility of the buyer to ensure they are in compliance with all applicable laws.
This item will only be shipped within United States.
Which version is right for me?
It would be absurd to think one moderator design would produce optimized sound attenuation for all rifles, peak performance is achieved by tuning moderators to their hosts. We call the metric for this air and sound served to the moderator, by the host, “Flow Factor.” The information necessary to calculate the flow factor of your host rifle can be found here. Select the moderator with a flow factor which most closely matches your own application, in order to maximize effective sound attenuation and ensure safe operation. Custom bores are available on request, please message us first. All designs are considered experimental.
Standard - Tuned on an FX Crown with a flow factor of 460. Factory configuration w/ extended shroud peak is 288.0
Moderate - Tuned on an FX Crown with a flow factor of 1,111. Factory configuration w/ extended shroud peak is 637.6
High - Tuned on an FX Dreamline with a flow factor of 6,500. Bare muzzle configuration (un-moderated) peak is 3,668.4
Falx trace, standard flow rev.1, as tested on a shrouded FX Crown .22. Average peak is 49.6. (note traces not to scale)
Rev.1 is an evolution of the well proven diode out of the Pilum line. Able to saturate and begin to function at very low flow factors, it is the logical place to start. Improved performance, as compared to the Pilum, comes from the fully floating damping section permitted by the modular architecture of the Falx, as well as the thinning of the retention struts allowing better penetrance of sound into the damping material.
Falx trace, moderate flow rev.2, as tested on a shrouded FX Crown .30. Average peak is 89.4 (note traces not to scale)
A core principle of engineering is to make every element perform multiple functions. In this way element count is minimized, mass is reduced, and strength is maintained. This line of inquiry lead to more and more complex diode struts as they were used for varying forms of air control vanes. Ultimately though, they consumed a great deal of space within the core. In flexion, the surfaces of an object bear the majority of the load while the core little to none. Thickening of the flexing member increases rigidity exponentially as well. Why not then expand and hollow the struts, then use the resultant channels as a flow path to feed the diodes? Struts could then occupy less volume, and contribute further to performance. The result is this rev.2 diode. It requires more air to saturate and function, hence its omission from the standard flow variant, but at moderate flow factor it performs exceptionally. The damping section remains unchanged from rev.1.
Falx trace, high flow rev.2, as tested on an unshrouded FX Dreamline .30. Average peak is 135.3.
This much air is definitely running into the space constraints of the Falx, and it shows mainly in the post-peak-sound. Were there space, more damping and another diode could cut this down, then again that’d just be a Sarissa. As it stands, this does an admirable job reducing the sound signature to something comfortable to the ear while adding only modestly to the length.