The Gemtech Lunar 9 9mm suppressor is a modular can that converts from a 7-inch long configuration to a 4.7-inch short one (Gemtech part no. 12711). Gemtech rates it for 9mm Luger and subsonic 300 Blackout, and the long form weighs 10 ounces against 7 ounces short. This version comes with a 1/2×28 LID assembly for threaded pistol barrels and is compatible with the GM-9 mounting options for other hosts. The body pairs 17-4PH stainless steel with 7075 aluminum. It suits a shooter who wants one 9mm suppressor for a pistol, a carbine and a subsonic 300 Blackout rifle.

Key Specifications

• The caliber rating is 9mm Luger and subsonic 300 Blackout, the two cartridges Gemtech lists.
• Length is 7 inches long or 4.7 inches short, so the can can be sized to the host.
• Weight is 10 ounces long and 7 ounces short, light enough to keep a pistol balanced.
• Diameter is 1.4 inches, a slim profile for a 9mm can.
• Materials are 17-4PH stainless steel and 7075 aluminum, a strong blast end with a light body.
• The finish is matte black Type III hard coat anodize, a durable coating for a daily-use can.
• The mount is a 1/2×28 LID assembly, set up for threaded 9mm pistol barrels.
• It is compatible with GM-9 mounting options, so the same can moves to other hosts.
• It is full-auto rated, which Gemtech defines as 4 to 8 round bursts every 4 to 8 seconds.
• Gemtech lists minimum barrel lengths of 3 inches for 9mm Luger and 8 inches for subsonic 300 Blackout.

Frequently Asked Questions

Is this the suppressor or just a mount? This is the complete Lunar 9 suppressor with a 1/2×28 LID assembly. Other mounts such as the LID with piston and the thread mounts are separate Gemtech parts.

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 are the barrel restrictions for the Lunar 9? Gemtech lists a minimum barrel length of 3 inches for 9mm Luger and 8 inches for subsonic 300 Blackout.

Buy the Gemtech Lunar 9 9mm Suppressor, 1/2×28 LID Assembly

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. It is a modular 9mm can that shortens for a pistol and lengthens for a carbine. Order through Gemtech‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.