The Sig Sauer MODX-45 (brand part no. MODX45) is a .45 ACP suppressor, threaded .578×28/M16x1LH for attachment to a compatible muzzle device. Sig Sauer builds it for shooters seeking dependable sound suppression on a compatible host firearm.

Key Specifications

• Rated for .45 ACP ammunition.
• Threaded .578×28/M16x1LH for attachment to a compatible muzzle device.
• Mounts via direct thread attachment.
• Built from titanium with fully modular, reconfigurable baffles, letting shooters trade baffle count for sound reduction or a shorter build.

Frequently Asked Questions

Is this an NFA item? Yes. As a suppressor, it's a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

What caliber is it rated for? .45 ACP.

How does it mount? .578×28/M16x1LH threading, direct thread attachment.

Buy the Sig Sauer MODX-45 Suppressor, .45 ACP

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4 and transfer through a licensed NFA (SOT/Class 3) dealer, with no federal transfer tax and an extended federal approval wait before delivery. Order through Sig Sauer‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will walk you through the transfer process.