The JK Armament 155 RPX .30 caliber suppressor in black is built on what JK Armament calls its most advanced baffle geometry, a design that suppresses both pistol and rifle calibers in one can (JK Armament part no. JK155RPX30). It is rated for cartridges up to .338 Lapua and stays light enough for hunting and precision rifles. Its .36 caliber baffles allow big bore and 9mm use with only an end cap swap. A titanium blast baffle supports its full-auto rating, and the industry-standard HUB mount opens up a lot of mounting options.

Key Specifications

• The rating is up to .338 Lapua, so one can covers everything from small rifle rounds to magnum hunting cartridges.
• It uses .36 caliber baffles, which allow big bore and 9mm use with only an end cap swap.
• The blast baffle is titanium, which supports the full-auto rating.
• The mount size is the industry-standard HUB 1.375×24, compatible with a wide range of QD and direct thread mounts.
• An ASR-compatible taper mount is installed, so it fits JK Armament muzzle devices and similar taper-mount brakes.
• The kit includes a taper mount, a 2.5-inch tube, one PRO rifle baffle, seven LT rifle baffles and a flash reducer end cap.
• JK Armament backs it with an unlimited, unconditional lifetime warranty.

Frequently Asked Questions

Can the RPX 30 be used on pistol caliber guns? Yes. JK Armament says its .36 caliber baffles allow big bore and 9mm use with only an end cap swap.

What mount does it use? It uses the HUB 1.375×24 mount size, and an ASR-compatible quick-attach taper mount is installed.

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.

Buy the JK Armament 155 RPX .30 Caliber 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 suppressor lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.