PEW Science published a new sound-signature test of the PTR VENT 1 on September 23, 2026, pairing the suppressor with an 8-inch Q mini FIX bolt-action rifle and Discreet Ballistics 190-grain subsonic 300 BLK ammunition. The tested direct-thread configuration earned a composite Suppression Rating of 81.5. That number describes the complete tested weapon system, not the suppressor in isolation, so it should not be carried over to a different rifle, barrel, ammunition load, or action type.
The exact test configuration
PTR Industries designed the VENT 1 as a .30-caliber centerfire rifle suppressor intended for 7.62x51mm NATO. PEW Science lists the suppressor at 1.74 inches in diameter and 8.75 inches long without a mount. Its included 5/8-24 direct-thread mount brings installed system length to 9.1 inches. The rear uses the common 1.375-24 HUB thread pattern, allowing other compatible mounts, although this evaluation used only the included direct-thread unit.
The VENT 1 has a monolithic, 3D-printed titanium structure. PEW Science measured the suppressor itself at 13.1 ounces and the direct-thread mount at 2.3 ounces, producing a tested total of 15.4 ounces. The report describes the internal design as a hybrid: PTR's Purposely Induced Porosity structure works alongside conventional baffle elements. That distinction matters because the laboratory attributes the measured pressure behavior to both the porous flow paths and the rest of the internal geometry, rather than to one feature alone.
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The free report covers a single five-shot test. PEW Science acquired muzzle data 1 meter, or 39.4 inches, left of the muzzle at 1 million samples per second. It also acquired data 0.15 meter, or 6 inches, to the right of the shooter's ear, but the detailed ear waveforms are reserved for members. The public report still provides the composite result, a hazard map, muzzle waveforms, and gross comparisons with other tested .30-caliber suppressor configurations.
What the measurements showed
PEW Science reports a muzzle Suppression Rating of 81.0 and says the operator rating remained in the 70s. On its scale, a lower rating represents greater predicted hearing-damage risk in the free field. The lab found that first-round-pop divergence was nominal in this test, while primary impulse accumulation stayed stable across the shots. It also observed low-amplitude free-field overpressure and a relatively quick blowdown, characteristics the report connects to continuous pressure and momentum release through the VENT 1's porous structure.
The report identifies a limit that a single headline rating can hide. As the global muzzle signature becomes very quiet, sound and pressure from the blast-chamber area and the closed bolt-action rifle's chamber make up a larger share of the shooter's exposure. PEW Science says those ancillary sources constrain the at-ear rating even though bystander performance is higher. The result is not a declaration that the setup is hearing-safe, and the laboratory specifically cautions that subsonic rifle combustion still creates meaningful pressure, impulse, and hearing-damage potential.
In PEW Science's published comparison set, the VENT 1 produced greater bystander hazard reduction on this host than the Liberty Precision Machine Mach-L, CGS Hyperion, Q Full Nelson, AAC 762-SDN-6, and Otter Creek Labs Hydrogen-L. The laboratory also says its operator hazard reduction met or exceeded results for the Full Nelson, Hyperion, LPM Anthem-S2 QD, and CAT ODB on the same type of subsonic bolt-gun test. Those are laboratory comparisons tied to PEW Science's protocol, not rankings for weight, durability, cost, backpressure, or semiautomatic function.
Boundaries of the result
The new test complements PEW Science's earlier evaluation of the same suppressor on a 20-inch .308 bolt-action rifle, where the direct-thread system received a 57.3 composite rating. The lab says the VENT 1 showed similarly smooth pressure transitions under both the higher-pressure supersonic input and the lower-pressure subsonic load. The new work was funded in part through PEW Science project PEW-PTR-084-001-24, and PTR gave written permission for publication of the data. Those disclosures do not replace the need to keep the finding tied to the tested setup.
PEW Science did not test alternate mounts in this evaluation, and its comments about likely automatic-fire durability and mount sensitivity are explicitly estimates or hypotheses. The report directs users to PTR for barrel-length and firing-schedule guidance. No date is given for mount-variation work, additional host testing, or a durability test. Until such data appears, the practical takeaway is narrow: the VENT 1 produced exceptionally high suppression scores with 190-grain subsonic 300 BLK on this specific 8-inch bolt-action host, while performance on gas-operated rifles, other loads, and other mounts remains unmeasured here.
About the Author
Nick Sawinyh - Nick Sawinyh is a father, husband, hobby farmer, and gun enthusiast from Kentucky. He founded GunsNation and writes most of what appears on this blog.
