The JK Armament RPX 155K (brand part no. JK155RPX9K) is a 9mm suppressor in a shorter RPX form factor, making it perfect for pistol-caliber carbines and 9mm handguns without sacrificing JK’s signature suppression performance. JK Armament ships the RPX 155K with a 1/2×28 piston/booster kit, built from black aluminum and titanium. The RPX 155K favors 9mm shooters who want a compact, dual-platform suppressor for both carbine and handgun use.

Key Specifications

• Rated for 9mm for pistol-caliber sound suppression.
• Measures 1.55 inches long for a shorter, compact form factor.
• Built from black aluminum and titanium.
• Includes a 1/2×28 piston/booster kit for handgun use.
• Direct-thread 1/2×28 mount for attachment to a compatible muzzle device.

Frequently Asked Questions

Is this an NFA item? Yes. As a suppressor, it’s a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

What caliber is it rated for? 9mm.

How does it mount? A 1/2×28 threaded direct-mount system, not a quick-detach mount.

Buy the JK Armament RPX 155K Suppressor

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through JK Armament‘s silencers and suppressed firearms lineup and our Lubbock, Texas team will walk you through the transfer process.