The AAC 300-SD titanium suppressor for .300 Blackout is Advanced Armament’s purpose-built can for subsonic .300 BLK (AAC part no. SR-103207). AAC prints the body from titanium and splits it into a two-piece modular design, so the shooter chooses between a long setup for maximum suppression and a short one for a compact host. It still handles supersonic .300 BLK when needed, which AAC lists as the maximum caliber. A 1.375×24 HUB-compatible interface and a direct thread HUB mount tie it into a wider system of mounts. For a Blackout shooter who values quiet subsonic performance above everything else, this is the can AAC built for the job.

Key Specifications

• Caliber is .300 BLK, the cartridge this suppressor was designed around.
• Maximum caliber is .300 BLK supersonic, so full-power loads are covered when needed.
• Long configuration length is 8.00 inches, the setup for maximum suppression.
• Long configuration weight is 12.2 ounces, light for a dedicated subsonic can.
• Short configuration length is 5.43 inches, for compact hosts where length matters more.
• Short configuration weight is 5 ounces, which barely changes how a rifle balances.
• Diameter is 1.60 inches across the body.
• Construction is 3D-printed titanium, which AAC uses for light weight and heat resistance.
• The silencer interface is 1.375×24 HUB compatible, which opens the door to HUB-pattern mounts.
• The mount is a direct thread HUB mount, 1x16LH compatible, with AAC’s Blackout flash hider in 1x16LH listed as the matching muzzle device.

Frequently Asked Questions

Can the 300-SD run supersonic .300 Blackout? Yes. AAC lists .300 BLK supersonic as the maximum caliber, although the can is built to make subsonic loads as quiet as possible.

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.

What muzzle device does AAC list for it? AAC lists its Blackout flash hider in 1x16LH as the matching muzzle device, with the suppressor mounting through a direct thread HUB mount.

Buy the AAC 300-SD Titanium Suppressor for .300 Blackout, 3D-Printed, Two-Piece Modular

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 Advanced Armament Corp‘s suppressor lineup and our Lubbock, Texas team will handle the transfer. Pick the long or short configuration to suit the host, and the same can covers both.