The Yankee Hill Machine Sidewinder M2 9mm Suppressor with 1/2×28 Piston (brand part no. YHM-2065-28) is a lightweight, user-serviceable handgun suppressor designed to be affordable without giving up features. Its booster system uses the industry’s unofficial standard piston, and a redesigned rear cap lets the owner swap pistons without tools. The Nielsen device keeps semi-automatic pistols cycling reliably, and both it and the baffle come out for cleaning with the provided disassembly tool. Ten index points let the shooter adjust point of impact while the can stays on the host.

Key Specifications

• The caliber rating is 9mm, sized for 9mm host pistols.
• Weight is 8.8 ounces, or 10.2 ounces with the piston, which keeps the load at the muzzle light.
• Overall length is 8.2 inches, or 8.35 inches with the piston.
• Body diameter is 1.375 inches, which sets how much room it needs around the slide and sights.
• Construction is 7075-T6 aluminum and 17-4 PH stainless steel, pairing light weight with durable stressed parts.
• The mount is a 1/2×28 piston, the common thread on threaded 9mm pistol barrels.
• YHM publishes a sound rating of 125 dB for the Sidewinder M2.
• The suppressor is full-auto rated, so it is built to take sustained fire.
• It offers 10 index points for adjusting point of impact while it stays mounted.
• Pistons swap without tools thanks to the new rear cap, which makes changing hosts quicker.

Frequently Asked Questions

Can I use it on a 300 Blackout? Yes, with subsonic ammunition. Yankee Hill Machine states it can be used on .300 BLK subsonic with a barrel of 7.5 inches or longer.

How do I clean the Sidewinder M2? Both the baffle and the Nielsen device can be removed for cleaning and maintenance using the provided disassembly tool.

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 Yankee Hill Machine Sidewinder M2 9mm Suppressor with 1/2×28 Piston

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 Yankee Hill Machine‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer and it ships fast to your Class 3 dealer.