The GSL Flea rimfire suppressor is a 2.3-ounce aluminum can from GSL Technology that mounts by 1/2×28 direct thread (brand part no. FL-100-SUP). GSL rates it for .22 LR, .22 Magnum and .17 HMR and lists a 29 dB sound reduction. At 3.625 inches long and 1 inch across, it barely changes the handling of a small rifle or pistol. It suits a plinking rifle, a rimfire trainer or a pest gun that you want to keep light.

Key Specifications

• Caliber rating is .22 LR, .22 Magnum and .17 HMR, the common rimfire cartridges.
• GSL publishes a sound reduction of 29 dB.
• Length is 3.625 inches, which keeps a rimfire host short.
• Diameter is 1.00 inch, slim enough for small-frame pistols and rimfire rifles.
• Weight is 2.3 ounces, close to unnoticeable on the muzzle.
• The body is aluminum with a hard coat anodized finish.
• The mount is 1/2×28 direct thread, the most common rimfire muzzle thread.

Frequently Asked Questions

Which cartridges is the Flea rated for? GSL lists .22 LR, .22 Magnum and .17 HMR.

How does it mount? It threads directly onto a 1/2×28 muzzle. GSL ships it as the suppressor alone.

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 GSL Technology Flea Rimfire Suppressor, 1/2×28 Direct Thread

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 GSL Technology‘s silencers and suppressors lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.