Thunderbeast Arms has introduced the SPIRO low back pressure suppressor, designed for 5.56mm caliber gas guns. It optimizes sound suppression while minimizing back pressure and cyclic rate increases. Made from advanced materials for durability, it is available in Direct Thread and HUB mounting styles, intended for extensive use without frequent removal.
Thunderbeast Arms states “The SPIRO is a low back pressure gas-gun suppressor that has excellent sound suppression levels at both the muzzle and at shooter’s ear. No longer do you have to compromise and have your gas gun suppressor be “Low back pressure but loud at the muzzle.”
The SPIRO increases back pressure gas flow by only approximately 50% compared to a bare muzzle (most LBP are 35-85%), which is 3X less gas than a Dominus-SR. The SPIRO only increases the cyclic rate of an Mk18 by about 5% (compared to 43% for a Dominus-SR; most LBP 3%-10%). This is while keeping Shooter’s Ear peak dBA at 136.8 (LEq dBA 124.2), and milspec-left muzzle position 135.4 dBA (LEq dBA 122.5). For reference, the Dominus is a few dB louder at the milspec position and at the shooter’s ear.
It is a “Go To War” suppressor designed for 10.5″, 5.56mm caliber assault rifles. It works great on .223 / 5.56mm caliber gas guns from 8″ up to 16″ or longer. The SPIRO is designed to be put on your 5.56mm carbine and shot a lot, only being removed for firearm maintenance and suppressor cleaning.
The SPIRO is made from Haynes 282, a nickel-chromium-cobalt-molybdenum “Super Alloy.” It is stronger than Inconel 718 and exceeds Inconel’s operating temperatures by about 500 degrees F. This makes the SPIRO almost indestructible. While our other “full auto rated” suppressors are guaranteed to last 10 cycles of the 8-mag SOCOM SURG test on a 10.5″ barrel, the SPIRO is rated for over 20 of the same cycles using an 8″ barrel instead of a 10.5″.
The SPIRO is currently available in two mount styles: Direct Thread (DT), and HUB (1.375×24 tpi standard, aka “Bravo”). DT is recommended for dedicated gas guns, where the intent is that the gun always has the suppressor mounted. In this case, retention is provided by using the included Nord-Lock washer. HUB is offered for user flexibility and users who are familiar with their own preferred mounting system. For the HUB version, the Thread End (TE) to First Baffle (TETFB) distance is 1.6″.”
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