JK Armament 155 RPX 9K 9mm Suppressor, 1/2x28 TPI Piston Assembly

JK Armament 155 RPX 9K 9mm Suppressor, Black

The JK Armament 155 RPX 9K combines a titanium blast baffle with a lightweight aluminum baffle stack in a modular 9mm suppressor. The compact K format emphasizes a manageable overall profile while retaining a configurable baffle system.

The Black suppressor includes a booster housing and 1/2x28 piston assembly, making compatible threaded pistols the starting application for the supplied mounting system. The 1.55-inch diameter keeps the body profile consistent across its approved modular configurations.

Choose the 155 RPX 9K 9mm Suppressor, Black at BattleHawk Armory.

Titanium Where the Blast Arrives First

A Grade 5 titanium blast baffle occupies the first baffle position, followed by 5 7075 aluminum baffles. The hybrid construction places the stronger, heat-resistant titanium component at the blast end while using aluminum to limit overall weight. It is a considered material mix for an owner who values a manageable suppressor without treating every application as an all-steel duty cycle.

Configurable Length and Sound Reduction

The 6-baffle system supports approved shorter and longer configurations. Shortening the assembly reduces length and weight at the muzzle; retaining more baffles increases the available suppression volume. The modular components also provide service access. The best arrangement depends on the firearm, cartridge, and intended use, rather than the model name alone.

Included Mounting Components

The RPX 9K includes a booster housing and 1/2x28 piston assembly. The piston supplies the 1/2x28 barrel-thread connection, while the booster assembly supports appropriate short-recoil pistol applications. Piston threading must match the barrel, and sufficient mounting clearance is required.

End Cap and Mounting Flexibility

A high-flow flash-hider end cap completes the suppressor. The 1.375x24 HUB rear interface supports compatible mounting options, subject to the required internal clearance and approved host application. A fixed-barrel carbine may require a different approved mount from the included spring-loaded piston assembly.

Cartridge-Specific Use Limits

The RPX supports approved 9mm and .300 Blackout applications, while its rifle ratings have separate sporting-use limits. For example, 5.56 NATO sporting use requires at least a 14.5-inch barrel, and .308 Winchester sporting use requires at least a 16-inch barrel. Those are cartridge-specific limits, not a blanket rifle rating.

Product Specifications

• Manufacturer: JK Armament
• Model: 155 RPX 9K
• Caliber class: 9mm
• Color: Black
• Diameter: 1.55 inches
• Baffle count: 6
• Blast baffle: Grade 5 titanium
• Remaining baffles: 5 in 7075 aluminum
• Finish system: Hard anodize and Cerakote
• Rear interface: 1.375x24 HUB
• Included mounting components: booster housing and 1/2x28 piston assembly
• End cap: high-flow flash-hider
• Configurable length with mount: 3.3-7.25 inches
• Configurable weight with mount: 7.5-13.1 ounces

Frequently Asked Questions

Which mounting components are included?

A booster housing and 1/2x28 piston assembly is included.

Can the suppressor length be changed?

Yes. The RPX 9K uses a modular 6-baffle system with approved shorter and longer configurations.

Is it made entirely from titanium?

No. It combines one Grade 5 titanium blast baffle with 5 aluminum baffles to balance material strength and weight.

Does a caliber match guarantee firearm compatibility?

No. Barrel thread, mounting system, internal clearance, cartridge rating, barrel length, and intended firing schedule must all suit the complete setup.

Shop the 155 RPX 9K 9mm Suppressor, Black at BattleHawk Armory.