The JK Armament 155 RPX 9 is a lightweight suppressor with a .36 caliber bore that handles both pistol and rifle cartridges, and this one is the Flat Dark Earth direct-thread version. JK’s RPX baffle design merges rifle and pistol suppression in one can, with a Grade 5 titanium blast baffle and seven user-configurable 7075 billet aluminum baffles. It is rated from 9mm and .357 Magnum up to 300 Win Mag, with minimum barrel lengths on some calibers. It is mission configurable, so baffles can be added or removed without special tools to change length and weight. A hunter or precision shooter who wants one can for several guns will find it useful.

Key Specifications

• The bore is .36 caliber, which lets the can run on pistol and rifle cartridges from 9mm up to 300 Win Mag.
• The baffle stack is a Grade 5 titanium blast baffle with seven 7075 billet aluminum baffles, built for durability at low weight.
• Length is 2.8 to 8.2 inches without a mount, adjustable by adding or removing baffles with no special tools.
• Diameter is 1.55 inches, slim enough to fit most handguards.
• The finish is Type 3 hard anodize with Cerakote, in Flat Dark Earth, a hard coating that resists wear.

Frequently Asked Questions

Does the RPX 9 run on rifles as well as pistols? Yes. JK rates it for .36 caliber and smaller cartridges, from 9mm and .357 Magnum up to 300 Win Mag, and minimum barrel lengths apply to some calibers.

Can I change its length? Yes. It is mission configurable, so you add or remove baffles without special tools to set the length and weight you want.

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 9 Suppressor, Flat Dark Earth, Direct Thread

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 silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer.