2025 Silencer Summit: The HARMONIX® platform ranked #1 out of 22 suppressors at the Shooter’s Ear in 9mm (133.20 dB), #1 in peak pressure (91.45 Pa), and #2 in dB(A). In 5.56, it placed top 8 in a field of 86. Because all HARMONIX® models share the same baffle geometry, these results apply equally to the ION. All testing independently conducted by Thunder Beast Arms Corporation.
Need more durability? All HARMONIX® suppressors suppress the same—the difference is material. The Ti•CONEL® (8.4 oz, $1,050) adds an Inconel 718 blast baffle at the hottest position while keeping titanium everywhere else—just 0.56 oz more than the ION. The Sentry (15.7 oz, $1,099) runs Haynes 282 superalloy from end to end for sustained full-auto and belt-fed duty. Compare all three tiers →
Grade 5 Titanium: The Material Behind the ION
Grade 5 Titanium (Ti-6Al-4V) is the most widely used titanium alloy in aerospace, medical, and defense applications—not because it’s cheap or easy to work with, but because its combination of properties is difficult to match in any other material. It delivers roughly the same tensile strength as many steels at 40% less density, exceptional corrosion resistance in virtually every environment a firearm will encounter, and a fatigue life that makes it well-suited to the repeated stress cycles a suppressor endures.
The ION is 3D-printed from Grade 5 Ti as a single monolithic structure—one continuous piece of titanium from front to back with no joints to loosen, no welds to fatigue, and no dissimilar metals to create galvanic corrosion. The result is 7.84 oz of suppressor that adds barely noticeable weight to the muzzle while delivering the same sound reduction as the 15.7 oz Sentry.
Why Grade 5 Titanium for a Suppressor?
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Strength-to-Weight Ratio
Grade 5 Ti has a density of ~4.43 g/cm³ compared to ~8.4 g/cm³ for nickel superalloys and ~7.9 g/cm³ for stainless steel. That density difference is why the ION weighs 7.84 oz while the Haynes 282 Sentry—with identical external dimensions—weighs 15.7 oz. Despite being nearly half the weight, Grade 5 Ti maintains tensile strength comparable to many stainless steels used in competing suppressors.
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Corrosion Resistance
Titanium forms a self-healing oxide layer that protects it from corrosion in environments that would attack steel or aluminum—salt spray, humidity, bore solvents, and the combustion byproducts that pass through a suppressor with every round. A titanium suppressor can sit in a safe for years between uses and come out looking exactly the way it went in.
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Fatigue Life
Every round fired is a mechanical and thermal stress cycle. Grade 5 Ti has an excellent fatigue endurance limit—below a certain stress threshold, it can withstand essentially unlimited cycles without developing cracks. This property is one of the reasons it dominates aerospace applications where cyclic loading is the primary failure mode, and it translates directly to suppressor longevity under normal use patterns.
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Additive Manufacturing
Grade 5 Ti is one of the most well-characterized alloys for metal additive manufacturing (3D printing), with decades of process development in aerospace and medical implant production. Faxon leverages this maturity to print the ION as a monolithic structure with internal baffle geometries that would be impossible to machine conventionally—the same complex gas-flow paths that give the HARMONIX® its sound suppression advantage.
Titanium vs. Superalloy: Understanding the Trade-off
Titanium’s one limitation relative to nickel superalloys is high-temperature performance. Grade 5 Ti retains excellent mechanical properties up to approximately 600°F (315°C), above which strength begins to decline. Nickel superalloys like Inconel 718 (used in the Ti•CONEL® blast baffle) and Haynes 282 (used throughout the Sentry) maintain their properties at significantly higher temperatures—1,200°F and 1,500°F respectively.
In practical terms, this matters most at the blast baffle—the first baffle in the stack, which takes the full brunt of every shot’s muzzle blast. Under normal firing schedules (semi-auto, standard mag dumps, typical range sessions), a Grade 5 Ti blast baffle performs well. Under sustained high-volume fire—belt-fed platforms, extended full-auto sessions, or institutional duty cycles with tens of thousands of rounds per year—the blast baffle sees temperatures where superalloy durability becomes meaningful.
| Property |
Grade 5 Ti (ION) |
Inconel 718 (Ti•CONEL®) |
Haynes 282 (Sentry) |
| Weight (complete) |
7.84 oz |
8.4 oz |
15.7 oz |
| Density |
~4.43 g/cm³ |
~8.19 g/cm³ |
~8.40 g/cm³ |
| Max Service Temp |
~600°F (315°C) |
~1,300°F (704°C) |
~1,500°F (815°C) |
| Corrosion Resistance |
Exceptional |
Excellent |
Excellent |
| Sound Suppression |
Identical |
Identical |
Identical |
| MSRP |
$975 |
$1,050 |
$1,099 |
The bottom line: for the vast majority of shooting patterns—range sessions, hunting, home defense, competition, recreational full-auto on semi-auto hosts—the ION delivers the same suppression performance as the Sentry at half the weight and the lowest price point in the lineup. If sustained high-volume or belt-fed use is in your future, the Ti•CONEL® adds superalloy durability at the blast baffle for just 0.56 oz and $75 more.
The ION name: Faxon has used the ION designation on its
lightweight AR-15 platforms for years—rifles built around minimizing weight without sacrificing capability. When the lightest HARMONIX® suppressor needed a name, ION was the natural fit: the same philosophy of premium materials and engineering in the lightest possible package.
Independent Testing: 2025 Thunderbeast Silencer Summit
The Thunderbeast Silencer Summit is one of the most rigorous independent suppressor testing events in the industry, conducted by Thunder Beast Arms Corporation under standardized conditions with calibrated equipment. The summit tested the HARMONIX® Sentry configuration, but because all HARMONIX® models share identical baffle geometry, these sound suppression results apply to the ION as well.
| Cartridge |
Position |
Result |
Ranking |
Field |
| 9mm — Pistol |
Shooter’s Ear dB |
133.20 dB |
#1 |
22 |
| 9mm — Pistol |
Shooter’s Ear Peak Pressure |
91.45 Pa |
#1 |
22 |
| 9mm — Pistol |
Shooter’s Ear dB(A) |
128.48 dB(A) |
#2 |
22 |
| 5.56 NATO — 16″ AR-15 |
Muzzle Right dB |
140.84 dB |
#5 |
86 |
| 5.56 NATO — 16″ AR-15 |
Muzzle Left dB(A) |
132.55 dB(A) |
#7 |
86 |
| 5.56 NATO — 16″ AR-15 |
Muzzle Right dB(A) |
136.19 dB(A) |
#7 |
86 |
| 5.56 NATO — 16″ AR-15 |
Muzzle Left dB |
139.05 dB |
#8 |
86 |
The takeaway: the ION delivers #1-ranked sound performance at 7.84 oz. No other suppressor in the 9mm field was quieter at the shooter’s position, and the ION achieves this with a multi-caliber rifle can—not a purpose-built pistol suppressor. In 5.56, the HARMONIX® placed in the top 8 out of 86 while being one of the shortest cans in the top 10 at just 6.75″.
Which ION Caliber Is Right for You?
All three ION suppressors share the same external dimensions, weight, Grade 5 Titanium construction, and full-auto rating—the only difference is bore diameter. A tighter bore delivers better suppression for that specific caliber, while a wider bore adds multi-caliber versatility.
| Model |
SKU |
Thread |
Covers These Calibers |
Best For |
| ION 5.56 |
FF-SIL-R-3DPC-556-02 |
1/2x28 |
5.56 NATO, .223 Rem, .224 Valkyrie, .22 Nosler |
Dedicated AR-15 hosts—tightest bore = best 5.56 suppression |
| ION .30 Cal |
FF-SIL-R-3DPC-30-02 |
5/8x24 |
.300 Win Mag, .308 Win, 6.5 CM, .300 BLK, 5.56, 6mm ARC, 6.5 Grendel |
Multi-caliber .30 cal and precision rifle—covers the most popular rifle cartridges |
| ION .36 Cal |
FF-SIL-R-3DPC-36-02 |
5/8x24 |
8.6 BLK, 9mm PCC, .350 Legend, .338 Federal, .308 Win, .300 BLK, 5.56, and everything the .30 Cal covers |
Widest versatility—one can for rifle and pistol-caliber platforms |
Rule of thumb: If you only shoot 5.56, get the dedicated 5.56—the tighter bore provides measurably better suppression and less gas blowback. If you shoot multiple .30 cal cartridges (.308, 6.5 CM, .300 BLK, .300 Win Mag), get the .30 Cal. If you need 8.6 Blackout, 9mm PCC, .350 Legend, or .338 coverage, the .36 Cal is the only bore size that handles those. If you want one suppressor for everything, get the .36 Cal.
Shared Specifications — All ION Models
Length6.75″
Weight (No Mount)7.84 oz
Body Material3D-printed Grade 5 Titanium
Blast BaffleGrade 5 Titanium (integral)
FinishHigh-Temperature Ceramic Coating
Max Body Diameter1.675″
Wrench Flats1.5″
Mount SystemHUB Mount Compatible
Full-Auto RatedYes (all calibers)
Thread (5.56)1/2x28 DT HUB Adapter included
Thread (.30 & .36)5/8x24 DT HUB Adapter included
MSRP$975
Mounting: HUB Mount & MuzzLok® Plan B Compatible
Every ION ships with a Direct Thread HUB Adapter matched to the caliber’s thread pitch (1/2x28 for 5.56, 5/8x24 for .30 and .36 Cal). The HUB mount interface is shared across all HARMONIX® and CORESYNC® suppressors, so HUB mount accessories are interchangeable across the lineup.
For quick-detach capability, pair any ION with a MuzzLok® Plan B Compatible muzzle device—attach and detach in seconds without tools. At 7.84 oz, the ION is light enough that moving it between hosts adds negligible weight to each platform.
Important: Standard MuzzLok® muzzle devices are not designed for suppressor mounting. For suppressor use, make sure you’re using
MuzzLok® Plan B Compatible devices specifically.
Frequently Asked Questions
Is the all-titanium ION durable enough for regular use?
Grade 5 Titanium is an aerospace-grade alloy with exceptional strength-to-weight ratio, corrosion resistance, and fatigue life. For the vast majority of shooting patterns—range sessions, hunting, competition, home defense, and recreational full-auto on semi-auto hosts—the ION is more than durable enough. Titanium’s practical limitation is sustained extreme heat at the blast baffle during high-volume fire. If your use case involves belt-fed platforms, extended full-auto sessions, or institutional duty cycles, the
Ti•CONEL® or
Sentry may be a better fit.
Why should I choose the ION over the Ti•CONEL®?
Weight and price. The ION is 0.56 oz lighter and $75 less than the Ti•CONEL®. Both suppress identically. The Ti•CONEL®’s advantage is an Inconel 718 blast baffle that handles higher sustained temperatures better than titanium. If you’re not regularly doing extended mag dumps, sustained full-auto fire, or belt-fed shooting, the ION gives you the same sound performance at the lowest weight and price in the HARMONIX® lineup.
Can I use the ION on a short-barreled rifle?
Yes. The ION is full-auto rated with no minimum barrel length restriction for semi-auto or bolt action hosts. Shorter barrels do produce higher gas temperatures at the muzzle, so if you’re running a short-barreled rifle at very high volume (e.g., a 10.3″ or 11.5″ with frequent extended mag dumps), the blast baffle will see more thermal stress than on a longer barrel. For normal firing schedules on short barrels, the ION handles it well. For extreme-volume short-barrel use, consider the
Ti•CONEL®.
What does the ION name mean?
Faxon has used the ION designation on its
lightweight AR-15 platforms for years—rifles built around minimizing weight without sacrificing capability. When the lightest HARMONIX® suppressor needed a name, ION was the natural fit: the same philosophy of premium materials and engineering in the lightest possible package.
What is the difference between ION, Ti•CONEL®, and Sentry?
All three share the same external dimensions, internal baffle design, and sound performance. The difference is material: ION is all Grade 5 Titanium (7.84 oz, $975),
Ti•CONEL® is Grade 5 Titanium with a machined Inconel 718 blast baffle (8.4 oz, $1,050), and
Sentry is all Haynes 282 superalloy (15.7 oz, $1,099). ION is lightest, Sentry is most durable, and Ti•CONEL® splits the difference.
Is the HARMONIX® full-auto rated?
Yes. All nine HARMONIX® configurations (three material tiers × three calibers) are full-auto rated with no minimum barrel length restriction for semi-auto or bolt action hosts.
What mount system does the HARMONIX® use?
All HARMONIX® suppressors use the Faxon HUB mount interface. Each ION ships with a Direct Thread HUB Adapter (1/2x28 for 5.56, 5/8x24 for .30 and .36 Cal). For quick-detach capability, pair with a
MuzzLok® Plan B Compatible muzzle device. Standard MuzzLok® devices are not designed for suppressor mounting.
How did the HARMONIX® perform at the Thunderbeast Silencer Summit?
At the 2025 Thunderbeast Silencer Summit, the HARMONIX® ranked #1 out of 22 suppressors at the Shooter’s Ear in 9mm in both dB and peak pressure, and #2 in dB(A). In 5.56, it placed #5 out of 86 at Muzzle Right and top 8 across all highlighted metrics. The summit tested the Sentry configuration, but because all three material tiers share the same baffle geometry, sound suppression results apply to the ION as well. All testing independently conducted by TBAC.
Is the $200 tax stamp still required?
The $200 tax stamp fee has been eliminated. Suppressors are still regulated under the National Firearms Act (NFA), and you still need to submit an ATF eForm 4 through a licensed dealer. Your dealer handles the paperwork at the time of purchase, and current eForm 4 processing times are significantly faster than they were a few years ago.
Can I use one ION on multiple hosts?
Yes. With the
MuzzLok® Plan B Compatible quick-detach system, you can move a single ION between multiple hosts in seconds. At 7.84 oz, swapping between rifles adds virtually no noticeable weight change. Make sure the suppressor’s bore is large enough for the caliber—a .30 Cal can also suppress 5.56, but a 5.56 cannot safely be used on .30 cal cartridges.
Where is HARMONIX® made?
HARMONIX®, Ti•CONEL®, Where Suppression Meets Equilibrium®, CORESYNC®, and MuzzLok® are registered trademarks of Faxon Firearms. All summit test data recorded and provided by Thunder Beast Arms Corporation. Faxon Firearms is not affiliated with TBAC.
