Thunder Beast: 338 Ultra SR Surge Brown Suppressor - Gen 1

Thunder Beast
Ultra-338-SR GEN1 - SB
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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: Surge Brown 
  • Use: Precision/Long-range on big-bore magnums that require military-spec retention


Once your suppressor purchase is finalized with Mile High Shooting, a Form 3 will be filed with the ATF requesting approval to transfer your suppressor to your chosen FFL. Initial processing can take 3-7 business days. Customers may help expedite this time frame by requesting the chosen FFL to send a copy of their FFL & SOT to Please note, initial processing time may be delayed further if your chosen FFL fails to provide required documentation in a timely manner. Once submitted, it takes 7-21 days for Mile High Shooting to receive the Form 3 approval. As soon as the approval is received, your suppressor and any accessories will be shipped to your chosen FFL within 24-48 business hours by 2 Day Air. Your chosen FFL will then contact you once it is received and you may complete your Form 4 processing at their facility. 

___LEGAL INFO______

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 DO NOT ALLOW private ownership of suppressors: CA, MA, DE, HI, NJ, NY, RI, IL, District of Columbia. CA allows class 3 dealers and class two manufacturers to possess suppressors.




  U.S. Government Export Restriction

This item is restricted for export by the State Department and Department of Commerce. Make sure that you are familiar with all applicable laws.  ITAR Information.


FFL Requirements & Magazine Restrictions

This item has to ship to an FFL. Please read the attached information. Shipping Rules & Magazine Restrictions.