Thunder Beast: 338 Ultra SR Suppressor - Gen 1

Thunder Beast
Ultra-338-SR GEN1
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The 338 ULTRA SR is TBAC's latest high-performance .338 caliber suppressor. It offers class leading suppression levels, a light weight design, and the new "SR" quick attach/detach mount that offers a locking Secondary Retention.

The 338 ULTRA SR will suppress a typical .338 Lapua Magnum bolt-action rifle down to approximately 135-138 dB at the muzzle, and approximately 124-128 dB at the shooter's ear . It also has very little or no "first round pop" (FRP) in most applications.

The 338 ULTRA SR weighs 20.2 ounces including the SR mount mechanism on the suppressor itself. The SR brake weighs 3.6 ounces. It is only compatible with the 338 ULTRA SR series of brakes and flash hiders.


  • Caliber: .338 caliber, up to .338 Lapua Magnum or .338 RUM
  • Material: Titanium
  • Length: 11.0 inches.
  • Diameter: 1.775 inches (suppressor body); 1.855 inches (rear collar)
  • Weight: 20.2 ounces
  • Mount: 338 ULTRA SR brake (included)
  • Brake Threads: 5/8-24, 3/4-20, 3/4-24, 3/4-28, M18x1.0, M18x1.5
  • Finish: High-Temp CeraKote: Black 
  • Use: Precision/Long-range on big-bore magnums that require military-spec retention



Mile High Shooting Accessories (MHSA) will only ship suppressors to Class III FFL holders. BATF regulation information for Suppressor ownership are as follows:

Be at least 21 years of age.
Be a U.S. citizen. 
Have no felony convictions or domestic violence convictions. 
Have no dishonorable discharge. 
Not deemed mentally unstable by a competent authority. 

The NFA rules/laws are posted through the BATF website. At this time, the following states ALLOW private ownership of suppressors: AL, AK, AR, AZ, CO, CT, FL, GA, IA, ID, IN, KS, KY, LA, ME, MD, MI, MN, MO, MS, MT, NC, NE, ND, NV, NH, NM, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, VT, WA, WV, WI, and WY. CA allows class 3 dealers and class two manufacturers to possess suppressors.