SBRX 556 silencer
SBRX 556 silencer

JK 155 SBRX™ 5.56mm – .30cal

(1 customer review)


Available on backorder

  • Add A Muzzle Device

    Add An Additional End Cap

  • Machined from 17-4 stainless steel and Grade 5 titanium
  • Designed for hard use on short barrels
  • Full-auto rated
  • Sounds great on 5.56, rated for up to 300 Win Mag
SKU: JK-155SBRX30 Categories: , ,
  • Specs
  • Features


SBRX 556 silencer

There’s quiet on a dB meter, and then there’s quiet to the ear. With JK Armament’s Tone Technology, you get both! Tone Technology refines the 155 SBRX’s sound signature for a solid, deep tone that’s more pleasing to the ear.

A lightweight, highly durable, Mission Configurable suppressor, the JK 155 SBRX is designed for heavy-duty use on bolt-action, semi-auto, and full-auto firearms, even with short barrels. Employing a 17-4 PH stainless steel blast baffle combined with four, user-configurable Grade 5 Titanium billet modular baffles delivers heavyweight durability in a lightweight silencer.

SBRX 556 silencer

In its micro configuration, the 155 SBRX is 3.3 inches long and weighs a shockingly light 4.4 ounces. In its full configuration with all five baffles, it’s still only 6.6 inches long and weighs just 12.8 ounces. By simply adding or removing baffles – no specialized tools are needed! – the user is able to choose the length, weight, and sound suppression that’s right for the firearm and the mission.

SBRX 556 silencer

Out on a long hunt, carrying your rifle for hours on end but, if all goes to plan, only shooting once? Clearing rooms with an M4? Run the 155 SBRX in a shorter configuration to reduce weight and maximize maneuverability. Spending some time on the range shooting steel targets at a distance? Stack up the baffles for maximum sound suppression.

SBRX 556 silencer

In addition to the modular baffle and end cap design, the 155 SBRX is even more Mission Configurable thanks to its industry-standard HUB 1.375×24 mount size. This means dozens of mounting options are instantly available! From the included JK 155 PRO Quick Attach Taper Mount, which fits our industry-leading JK muzzle devices, to direct thread fixed mounts, tri-lug mounts, QD mounts, pistol boosters, and much more, the versatility of the HUB standard can’t be overstated.

The JK 155 SBRX is rated for cartridges up to and including 300 Win Mag while also being optimized to sound and work great on 223/5.56. It’s full-auto and short-barrel rated. See the Barrel and Caliber Ratings chart below for more information.

SBRX 556 silencer


(1) JK 155 PRO Quick Attach Taper Mount

(1) JK 155 PRO 2.5” Tube

(1) JK 155 HD Rifle Baffle

(4) JK 155 PRO Rifle Baffle

(1) JK 155 PRO Flash Reducer End Cap


Spec NameSpec Value
Length 3.3”- 6.6” (Configurable)
Length No Mount 2.8”- 6.0” (Configurable)
Diameter 1.55”
Weight 4.4 - 12.8 oz (Configurable)
Color Armor Black
Material 17-4 Stainless Steel & Ti-6AL-4V Titanium (Grade 5)
Coating Armor Black C-192 Cerakote


Pride and quality workmanship goes into all of our American-made, JK products, and we stand behind them! WE GUARANTEE OUR PRODUCTS

1 review for JK 155 SBRX™ 5.56mm - .30cal

  1. Manuel M

    Used on a PSA 8.5” 300 Blackout. Subs were a ton of fun. Used with a War Eagle and flash hider end cap.

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Example Build 1
Example Build 2
  • 155 Series
  • HD base tube
  • Baffles:
    • 1x .30 cal HD Rifle
    • 4x .30 cal PRO Rifle
    • 5x 9mm LT Pistol
  • LT Extension Tube
  • End Caps:
    • 1x .22 cal LT Flash Hider
    • 1x .30 cal LT Compensator
    • 1x 9mm LT Flash Reducer
  • Mounts:
    • 1x PRO QA Taper Mount
    • 1x 1/2x28 Thread Mount
    • 1x 5/8x24 Thread Mount
    • 2x .22 cal Bald Eagle
    • 2x .30 cal Bald Eagle
    • 1x 9mm Bald Eagle
    • 1x 1/2x28 Pistol Booster

With this build I can suppress every .30 caliber and smaller rifle and every 9mm and smaller pistol in my collection. Whether I’m running my AR-15 or AR-10 hard – even full-auto – or I’m on a spot-and-stalk hunt with a lightweight bolt-action rifle, or I’m plinking or varmint hunting with a rimfire rifle, or I’m shooting pistols and pistol caliber carbines in 9mm or smaller, this one suppressor can be configured so it’s ideally suited for each and every one of those things and more.

Heck, if I also owned a 45 ACP pistol and/or a 458 SOCOM rifle or a .45 cal lever action I could add 5x .45 cal LT and/or PRO Pistol baffles and have those guns covered, too!

  • 105 Series
  • LT base tube
  • Baffles:
    • 1x .22 cal HD Rimfire
    • 6x .22 cal LT Rimfire
    • 6x 9mm LT Pistol
    • LT Extension Tube
  • End Caps:
    • 1x .22 cal LT Flash Reducer
    • 1x 9mm LT Flash Reducer
  • Mounts:
    • 1x 1/2x28 Thread Mount

With this build I can suppress all of my rimfire rifles and pistols plus anything in 5.7x28mm. It’s also a Mission Configurable 9mm pistol and PCC suppressor that’s capable of being run in a full configuration for training on the shooting range and a short configuration for concealed carry. It’s so lightweight that it doesn’t need a booster!