The Dead Air Silencers Thread Adapter, 1/2×28 for SIG MOS pistols (brand part no. DA420) converts a SIG MOS-pattern barrel to the widely used 1/2×28 pattern, opening up compatibility with the broad range of suppressors and muzzle devices built around that standard thread. It’s a straightforward, purpose-built solution for SIG MOS owners who want suppressor options beyond whatever proprietary thread the factory barrel shipped with. The adapter installs by hand-threading onto the existing barrel thread. It ships as a standalone accessory, separate from any suppressor or pistol.

Key Specifications

• Converts a SIG MOS-pattern barrel thread to the 1/2×28 pattern, one of the most common pistol suppressor threads.
• Opens up compatibility with the wide range of suppressors and muzzle devices built for the 1/2×28 standard.
• Installs directly onto the existing SIG MOS barrel thread without gunsmithing.

Frequently Asked Questions

What does this adapter do? It converts a SIG MOS-pattern barrel thread to the widely used 1/2×28 pattern.

Why would I need this adapter? It lets a SIG MOS pistol accept the broad range of 1/2×28-threaded suppressors and muzzle devices.

Does this fit any SIG pistol? It’s built specifically for SIG MOS-pattern barrels.

Buy the Dead Air Thread Adapter, 1/2×28 for SIG MOS

Order the Thread Adapter, 1/2×28 for SIG MOS from our Lubbock, Texas gun shop for fast, direct shipping. Browse more pistol accessories in our Class 3 parts & accessories category.