Jk Jk155Piston5X28Bn 155 Piston 1/2X28 9mm Blk

The JK Armament 155 Piston is a 1/2x28 threaded piston assembly built for 9mm handgun applications. This component is engineered for shooters running suppressors on their 9mm pistols who need a reliable, precision-machined piston to cycle properly with their silencer system. JK Armament's piston design works with standard 1/2x28 suppressor mounts—the industry standard thread pattern for most 9mm cans—making it a straightforward swap for your current setup.

The 155 piston is constructed from nitride stainless steel, a finish that resists corrosion and handles repeated cycling without degradation. This matters because pistons live in a harsh environment inside your suppressor—they're exposed to hot gas, carbon buildup, and thermal cycling shot after shot. A durable, well-finished piston keeps your suppressor functioning reliably and makes maintenance easier down the road.

If you're running a 9mm pistol with a suppressor and your current piston is worn, cracked, or just not cycling right, this replacement unit gets you back to smooth, consistent function. It's a straightforward parts swap and a solid choice from a manufacturer known for precision suppressor components.

Key Features

• 1/2x28 threaded mount—compatible with standard 9mm suppressor platforms
• Nitride stainless steel construction for corrosion resistance and durability
• Designed specifically for 9mm Luger pistol suppressors
• Direct replacement piston assembly

Specifications

Frequently Asked Questions

Will this piston work with my 9mm suppressor?

This piston is built for 1/2x28 threaded suppressors designed for 9mm pistols. If your suppressor uses the 1/2x28 mount and is rated for 9mm, this piston should be compatible. Always verify your suppressor's specifications before purchasing a replacement piston.

What is a suppressor piston and why would I need to replace it?

A piston is the floating component inside a suppressor that helps regulate gas flow and cycling. Over time, pistons can wear, develop cracks, or become coated with carbon buildup that affects performance. A replacement piston restores reliable cycling and suppression function.

Is this a direct replacement part?

This is a 155 piston assembly from JK Armament. Confirm compatibility with your specific suppressor model before installation, as piston fitment can vary by manufacturer and suppressor design.