The AAC Illusion 9 Piston is a replacement piston threaded at 1/2×28, built to let owners swap an existing AAC Illusion 9 silencer onto a host firearm with a different barrel thread from Advanced Armament Corp (AAC) (brand part no. 64246). Machined from heat-treated stainless steel with a bead-blasted matte finish, each piston is engraved with its thread diameter, pitch, and rotation direction to keep installation straightforward. It’s a service part, not a standalone suppressor, so it ships and transfers like any other Title I accessory.

Key Specifications

• A piston that threads into the rear of a compatible AAC silencer, not a standalone suppressor.
• Threaded at 1/2×28 to match that specific barrel thread.
• Lets an owner swap a suppressor between host firearms with different thread pitches by changing the piston.
• Machined from heat-treated stainless steel.
• Finished with a bead-blasted matte finish, and engraved with the thread diameter, pitch, and rotation direction for correct installation.

Frequently Asked Questions

Is this piston itself a regulated NFA item? No, it’s a replacement piston for an existing AAC silencer, not a suppressor on its own.

What thread pitch is this piston built for? 1/2×28.

Buy the AAC Illusion 9 Piston

Swap your AAC silencer to a 1/2×28-threaded host with this genuine AAC Illusion 9 piston. Order it from our Lubbock, Texas gun shop, and browse our Class 3 accessories selection for more Class 3 accessories.