The Gemtech Lunar-45 .45 ACP suppressor is a modular can in matte black that converts from an 8.6-inch long configuration to a 6.9-inch short one (Gemtech part no. 12126). Gemtech also rates it for 10mm, .40 S&W, subsonic 300 Blackout and 9mm Luger, so one can serves several pistol hosts. The long form weighs 12.3 ounces and the short form 10.9 ounces, in a titanium and aluminum body. It mounts with a .578-28 piston, the thread used on most threaded .45 ACP barrels. It suits a shooter with a threaded .45 who also runs a 9mm or a 10mm.

Key Specifications

• The primary caliber is .45 ACP, the cartridge Gemtech names as the intended use.
• Gemtech also rates it for 10mm, .40 S&W, subsonic 300 Blackout and 9mm Luger, with 10mm and .40 S&W for dry use only.
• Length is 8.6 inches long or 6.9 inches short, so the can can be sized to the host.
• Weight is 12.3 ounces long and 10.9 ounces short, light for a .45 suppressor.
• Diameter is 1.375 inches, a standard size for a .45-caliber can.
• Materials are titanium and aluminum, a pairing aimed at keeping the can light.
• The finish is matte black Type III hard coat anodize, a durable surface for repeated handling.
• The mount is a .578-28 piston, the pitch used on most threaded .45 ACP barrels.
• It is full-auto rated, which Gemtech defines as 4 to 8 round bursts every 3 to 6 seconds.
• Gemtech lists minimum barrel lengths of 3 inches for 9mm Luger and 8 inches for subsonic 300 Blackout.

Frequently Asked Questions

Which calibers can the Lunar-45 suppress? Gemtech names .45 ACP as the intended use and also lists 9mm Luger, subsonic 300 Blackout, and 10mm and .40 S&W for dry use only.

Can the Lunar-45 be shortened? Yes. Its baffle design converts the can from the 8.6-inch long configuration to a 6.9-inch short one.

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-45 .45 ACP 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. It is one modular can for a .45 pistol that also covers 9mm and 10mm. 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.