The JK Armament RPX 9mm suppressor in black is the standard RPX model, a modular all-purpose can with a .36 caliber bore (JK Armament part no. JK155RPX9). It is separate from the shorter RPX 9K and is built to handle both pistol and rifle cartridges, from 9mm up to 300 Win Mag within JK Armament’s barrel length limits. A Grade 5 titanium blast baffle is stacked with user-configurable 7075 billet baffles, so the owner can set length, weight and sound level. It is a sound pick for the shooter who wants one dedicated can across pistols, carbines and rifles.

Key Specifications

• The bore is .36 caliber (9mm), rated for 9x19mm, .38 Special, .357 Magnum and many rifle cartridges.
• Length is 3.3 to 8.7 inches with the mount, from the micro configuration to all eight baffles.
• Weight is 3.6 to 11 ounces, depending on the number of baffles installed.
• Diameter is 1.55 inches, a slim tube for a rifle-rated can.
• Construction is Ti-6Al-4V Grade 5 titanium and 7075 billet aluminum, with a titanium blast baffle for durability.
• Mounting is the JK 155 LT Quick Attach Taper Mount, included, with industry-standard HUB 1.375×24 sizing.
• The finish is black in Type III hard anodize and Cerakote, which stands up to wear.

Frequently Asked Questions

Is this the RPX 9K? No. This is the standard RPX 9mm in black, which is longer when fully built and uses a taper mount. The RPX 9K is a separate, shorter model in JK Armament’s line.

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.

What cartridges can it be used with? JK Armament rates it from 9mm and other pistol cartridges through rifle calibers up to 300 Win Mag, with minimum barrel lengths that apply to some calibers.

Buy the JK Armament RPX 9mm Modular Suppressor, Black

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 JK Armament‘s suppressors and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.