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; ATF approval on most individual eForm 4 filings now comes back in days, and trusts take a little longer. Order through Sig Sauer‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will walk you through the transfer process.