The TBAC 338 Ultra SR .338 Caliber Suppressor, Black is the Secondary Retention version of Thunder Beast Arms Corporation’s Gen2 338 Ultra, a lightweight titanium suppressor for .338 Lapua Magnum rifles. TBAC calls the Gen2 338 Ultra the quietest .338 caliber suppressor for everything up to .338 Lapua Magnum, and the SR mount adds a fail-safe locking mechanism that keeps the suppressor on the brake until you release it by hand. The body is titanium in a black Cerakote finish. It also handles 6mm, 6.5mm, .308 and .30 caliber magnum rifles, so one suppressor can cover several of a long-range shooter’s guns.

Key Specifications

• Caliber rating is .338 caliber, up to .338 Lapua Magnum or .338 RUM, with TBAC rating it for .338 Lapua down to 16-inch barrels.
• The body is titanium with a tubeless, fully welded baffle stack and helical baffle technology, a Gen2 build that keeps weight low on a big-bore can.
• Body diameter is 1.8 inches with a 1.85-inch collar, the envelope that .338-class gas volume requires.
• The mount is TBAC’s SR (Secondary Retention) system, a patented paw-and-cam design that locks in at least two positions and enables quick mount and quick detach.
• The finish is black Cerakote over the titanium body.

Frequently Asked Questions

How is the SR mount different from the BA mount? The SR mount is a secondary, fail-safe lock that retains the suppressor on the muzzle brake until you remove it by hand, and it uses a coarser thread that cuts the number of turns to mount. TBAC lists the SR version as 0.60 inch longer and 2.8 ounces heavier than the BA version.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Buy the TBAC 338 Ultra SR .338 Caliber Suppressor, Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through TBAC’s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. It is the SR-mount .338 Ultra for shooters who want the secure lockup along with a lightweight titanium build.