JK ArmamentJK 155 Piston 1/2x28 9mm (Black Nitride)
Piston · attaches to 1/2x28 · presents JK 155 Piston · fits 796 suppressors in the catalog
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thread
1/2x28
material
17-4PH Stainless Steel
standard
JK 155 Piston
MSRP
$105
A piston, sometimes called a Nielsen device, screws into the back of a pistol suppressor. Most pistol barrels tilt as the action cycles, and the weight of a suppressor can stop that. The piston adds a spring between the suppressor and the barrel so the pistol keeps cycling. Match the piston's thread to your pistol's barrel.
This one fits suppressors that take the JK 155 Piston and barrels threaded 1/2x28.
How mounting systems work →Photos
Image: JK Armament
- Type
- Piston
- Material
- 17-4PH Stainless Steel
- Attaches to
- 1/2x28
- Presents
- JK 155 Piston
- Tool access
- rear
- MSRP
- $105
Not published by the manufacturer: overall length, weight.
Prices are manufacturer's suggested retail (MSRP). What you pay may differ.
796 suppressors in the catalog take this part, across 118 manufacturers including AAC, AB Suppressor, Abel Co. You aren't locked into one manufacturer's suppressors.
- JK Armament JK 155 GOAT HF 5.56
- AAC 300-SD
- AB Suppressor A-10 5.56
- …and 793 more.
Which ones fit your barrel and host?
See all 796 in the Builder- The piston screws onto the threaded pistol barrel and mates suppressor and pistol together; it pairs with the JK Piston Mount.
- Precision machined from 17-4 PH stainless steel.
- Available in 1/2x28 threads for nearly all 9mm and some other pistols, and .578x28 threads for .45 ACP and some larger-than-9mm pistol calibers.