The SIG Sauer MODX-45 .45 ACP suppressor (SIG Sauer part no. MODX-45) is a modular titanium can for .45 caliber handguns and pistol-caliber carbines. Its fully modular baffle stack lets the shooter set length, weight and sound reduction to suit the gun and the day. It mounts with direct-thread pistons, and the thread patterns covered are .578×28 and M16x1 left-hand, which cover typical threaded .45 ACP barrels. Titanium construction keeps it light on a pistol slide, and the design comes apart for cleaning. It suits a shooter who wants one .45 can that can be run long or kept short.

Key Specifications

• Caliber is .45 ACP, a cartridge that suppresses well and suits this modular build.
• The construction is titanium, which keeps weight down on a pistol barrel.
• The baffle stack is fully modular, so length, weight and sound reduction can be configured.
• The mount is direct thread with pistons, installed straight onto the threaded barrel.
• Thread patterns are .578×28 and M16x1 left-hand, covering the common .45 ACP barrel threads.
• The finish is black DLC, a hard coating chosen for wear resistance.
• The suppressor disassembles for cleaning, which simplifies maintenance.
• It is intended for .45 caliber handguns and pistol-caliber carbines, so one can serves both.
• The box includes M16x1 left-hand pistons and a piston spring, supplied with the suppressor.

Frequently Asked Questions

Which barrel threads does the MODX-45 fit? It covers .578×28 and M16x1 left-hand thread patterns through its direct-thread pistons.

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.

Can the length be changed? Yes. The baffle stack is fully modular, so the shooter can configure length, weight and sound reduction.

Buy the SIG Sauer MODX-45 .45 ACP Modular Titanium Suppressor

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 SIG Sauer‘ suppressors and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.