The Gemtech Lunar 9 suppressor is a modular 9mm can that converts from a 7-inch long configuration to a 4.7-inch short one (brand 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 family of 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 300 Blackout subsonic, 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.
• The design is modular, so the baffle stack converts between the long and short forms.
• It is full-auto rated, which Gemtech defines as 4 to 8 round bursts every 4 to 8 seconds.

Frequently Asked Questions

Is this the suppressor or a mount? This is the complete Lunar 9 suppressor with a 1/2×28 LID assembly. The LID with piston and the thread mounts are separate Gemtech parts that let it fit other hosts.

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.

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 Gemtech Lunar 9 Suppressor, 9mm, 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.