Thunder Beast: 338 Ultra SR Suppressor - Gen 2

Thunder Beast : Ultra-338-SR GEN2
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The Gen2 338 Ultra SR is the quietest .338 caliber suppressor on the market today for everything up to .338 Lapua Magnum. It's quieter than the Gen1 by about 3db, and .2 ounces lighter. It offers class leading suppression levels with extreme light weight. It has the same SR (Secondary Retention) mount as the Dominus-SR, Dominus-K-SR, and Magnus-SR. This model is 0.60-inch longer and 2.8 ounces heavier than the BA Version (338 Ultra non-SR). The Gen2 338 Ultra SR has the same Hard-Use/Full-Auto as the DOMINUS-SR, ie, Lifetime to exceed at least 10 SURGE cycles on a 10.5" M4 / MK18.




  • Caliber: .338 caliber, up to .338 Lapua Magnum or .338 RUM
  • Material: Titanium
  • Length: 11.0 inches.
  • Diameter: 1.8 inches (suppressor body); 1.85 inches (rear collar)
  • Weight: 20 ounces
  • Mount: 338 ULTRA SR brake (included)
  • Finish: High-Temp CeraKote: Black 
  • Use: Precision/Long-range on big-bore magnums, Hard use/Full-auto


Minimum Rated Barrel Lengths

  • 5.5" .300 Blackout (Full power and Subs), 6.8 SPC, 7.62x39,
  • 8" .308, 6.5 Creedmoor, .260 Rem, 6 Creedmoor, .243 Win, .22 Creedmoor, .223/556 (SEMI AUTO)
  • 10.3" .223/556 (FULL AUTO per Dominus-SR schedule)
  • 12" 26 Nosler, 6.5 SAUM, 6.5 PRC, 7 WSM, 7 SAUM, 7 STW, 7 RM, 300 WSM
  • 14.5" 300 PRC, 300 RUM, 7 RUM, 300 WM, 300 WBY, 6.5-300 WBY
  • 16" 300 NORMA, 28 Nosler, 338 LAPUA, 338 NORMA









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.