Thunder Beast ArmsSuppressorsMid-Range

Thunder Beast Arms Spiro 5.56

Haynes 282 low-back-pressure 5.56 built around an unusually severe published full-auto durability schedule

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+Takes severe heat and short-barrel abuse without needing the weight of a larger duty can
+Keeps bolt speed and gas-to-face close to the rifle's unsuppressed behavior
+The 5.9-inch body stays compact on an 8-inch or 10-inch host
+HUB threads let you keep an existing mount system instead of rebuilding every rifle around one muzzle device
+Nord-Lock direct thread is a simple option for a suppressor that will stay on one host

−The 15.5 oz body feels noticeably heavier than the titanium cans on a short rifle
−Buy it for heat resistance and low gas, not for the softest possible report
−The 5.56-only bore gives you no useful cross-caliber flexibility
−A direct-thread setup is less convenient if you move one suppressor between several rifles
−The HUB version ships with no mount, and TBAC makes its full-auto rating conditional on your mount staying tight

Length: 5.9 inches (5.3 inches added, direct-thread)
diameter: 1.8 inches
weight: 15.5 oz
Material: Haynes 282 nickel-chromium-cobalt-molybdenum superalloy
Mount Type: Direct thread 1/2-28 with an included Nord-Lock washer, or HUB 1.375x24 with no mount included
minimumBarrelLength: Designed around the 10.3-inch MK18; SURG-tested on an 8-inch barrel
ratedCalibers: 5.56 NATO / .223 REM, up to .22 Creedmoor
soundReduction: TBAC reports 124.9 dBA SE LEQ and 124.4 dBA mil-spec-left LEQ; no PEW SR as of August 2026
fullAutoRated: Yes (20+ cycles SOCOM SURG on 8-inch barrel)
warranty: TBAC lifetime warranty