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JK Armament 155P (MST) Kit

In stock

JK Armament 155P Modular Solvent Trap (MST) Kit

As low as $414.00
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Introducing the all new lightweight, affordable, and American made Modular Solvent Trap (MST) Pistol / Sub Gun Kit designed for the end user!



  • (1) JK 155 2.5" Tube
  • (8) JK 155P Cup/Divider Radial
  • (1) JK 155P End Cap


Options Below

1.180-24 TPI Adapter are compatible with the following,

  • Liberty 3 Lug Mount
  • Gemtech 3 Lug Mount
  • SDTA 3 Lug Mount
  • Liberty Booster
  • Gemtech LID Booster
  • SDTA Booster
  • MMW Reflex OTB Mounts


1.125-28 TPI are compatible with the following,

  • Silencerco Octane 3 Lug Mount (AC2447/AC2448)
  • Silencerco Alpha ASR Mount (AC2632)
  • Griffin Plan A (TMA1125x28)
  • Griffin A2 Optimus Blast Sheild
  • Area419 Hellfire Mount (Harvest Option)


HD Thread Mounts

  • 1/2-28 TPI
  • DOES NOT include a booster or three lug assembly


  • Length: Short 3” /Long 8.25” (Configurable)
  • Diameter: 1.55”
  • Weight: Short 4.8 oz / Long 11.8 oz (Configurable)
  • Color: Black
  • Material: T6-7075 Billet Aluminum
  • Coating: Type 3 Hard Anodize


Thread Adapter Options:

  • 1.125-28 TPI
  • 1.180-24 TPI
  • T-6 7075 Billet Aluminum


HD Thread Mount Options:

  • 1/2-28 TPI
  • Heat Treated 4140 Chrome Moley Steel
  • Black Oxide Finish


Tools: All outside flats use the JK Armament Wrench or standard 1 1/2" SAE American tools.

Compatible with: Industry Standard tube thread, 1.375”-24 TPI






    A Disclaimer from JK Armament

    "JK Armament is selling parts and products for solvent traps.

    Solvent traps are a “firearm accessory” as such they can be attached to the end of the barrel, with an adapter, as a cleaning accessory and are not considered as anything other than an accessory because a projectile, or bullet, cannot pass through the tube without modification.

    Solvent traps can be purchased legally without a Form 1.

    You cannot, however, modify, alter or redesign them into a device for silencing, muffling or diminishing the report of a firearm without first filing and receiving back from BATFE an approved Form 1. Be aware of the restrictions and regulations.

    Only after getting the approved Form 1 back can you make any modifications to the product. A crime is committed if you make the alterations before obtaining the tax stamp. Felony alert! Don’t do any alteration or modifications to our products before getting the approved Form 1 back.

    JK Armament disclaims any responsibility for your actions if you fail to follow these guidelines or any applicable laws. This includes Federal as well as state, county and municipal laws and regulations.

    We also cannot be responsible for any result, consequence, damage or liability following any modifications or work done on our product after purchase. This includes third party liability.

    No recommendation or endorsement of any modification, work or alteration to our product is made by these statements. Any such work, alteration and/ or modification is done at the sole risk and liability of the product owner. If you decide to make any modification or alteration to our products, please first read, review and follow all Federal regulations regarding NFA items.

    The stated intent of a solvent trap is to catch and trap gun cleaning solvent during bore cleaning operations commonly performed on firearms. Solvent traps do attach to the muzzle of a firearm but do not have any design features intended to allow a bullet to pass through them.

    Since as originally manufactured they are not intended to silence, muffle or diminish the report of a portable firearm they are not silencers as defined in 18 U.S.C. 921(a)(24) and thus also are not firearms as defined in 18 U.S.C. 921(a)(3) or 26 U.S.C. 5845(a)(7).

    However, if the solvent trapped was redesigned or utilized to assemble a device for silencing, muffling or diminishing the report of a portable firearm or if intent was demonstrated to use the device for silencing, muffling or diminishing the report of a portable firearm, the solvent trap would be classified as a “firearm silencer” as defined in 18 U.S.C. § 921(a)(24) and as a “firearm” as defined in 18 U.S.C. § 921(a)(3)(C) and 26 U.S.C. § 5845(a)(7)."

More Information
Manufacturer JK Armament