Thunder Beast: 338 Ultra, Reduced Recoil, SR, Suppressor

Thunder Beast
All orders for optics and related items will be verified before shipment. When purchasing an item on pre-order, do not add additional products to the cart. Any additional items will not ship until the entire order can be fulfilled.
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When purchasing an item on pre-order, do not add additional products to the cart. Any additional items will not ship until the entire order can be fulfilled.
The new 338 ULTRA is the quietest .338 caliber suppressor on the market today for everything up to .338 Lapua Magnum, including your 6's, 6.5's, 7's, and .30's. It offers class leading suppression levels with extreme light weight.
The 338 ULTRA SR has the same SR (Secondary Retention) mount as Thunder Beast Dominus-SR, Dominus-K-SR, and Magnus-SR. This model is 0.60-inch longer and 2.8 ounces heavier than the BA version. This version 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. The BA version of the 338 ULTRA is NOT full-auto rated due to the mount being insufficient. The GEN2 SR weight is 0.2 ounces lighter than the GEN1 version.
The RR variants of the 338 ULTRA almost double the recoil reduction (compared to a bare muzzle) of the normal flat-cap version of the suppresor. On 338LM, the 338 ULTRA-RR has a recoil reduction of 54% --- vs normal version 32%. 


  • 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


Minimum Rate 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


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.