The SIG Sauer Hexium 556 Ti is a black titanium suppressor for 5.56 NATO rifles, built around a 3D-printed titanium core (SIG Sauer part no. HEXIUM556). It measures 6.2 inches long, a compact size for an AR-15 carbine or a short-barreled rifle. A HUB-compatible direct-thread mount cut 1/2-28 threads it straight onto a standard AR-15 barrel. Titanium keeps the weight down at the muzzle, the part of the rifle where every ounce shows. It is a light, compact can for 5.56 shooters who want to run suppressed without a front-heavy rifle.

Key Specifications

• The caliber rating is 5.56 NATO, the cartridge this model is built for.
• The body is titanium, which keeps the can light on the end of the barrel.
• The core is 3D-printed titanium, made by additive manufacturing rather than stacked baffles.
• Overall length is 6.2 inches, compact enough for a carbine or short-barreled rifle.
• The mount is a HUB-compatible direct thread, threading straight onto the barrel.
• The thread pitch is 1/2-28, the standard muzzle thread on AR-15 barrels.
• The finish is black, matching most AR-15 rifles.
• The rear interface follows the HUB standard, the 1.375×24 pattern that accepts other HUB-compatible mounts.

Frequently Asked Questions

How is the titanium Hexium 556 different from the Inconel model? This version uses a 3D-printed titanium core for lower weight and measures 6.2 inches, against 5.9 inches for the heavier, more heat-resistant Inconel model.

What thread does it use? It comes with a HUB-compatible direct-thread mount cut 1/2-28, the standard AR-15 pitch.

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 SIG Sauer Hexium 556 Ti 5.56 NATO 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 SIG Sauer‘s suppressors and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. Light at the muzzle and short enough for a carbine, it keeps a suppressed AR balanced.