9 Best Trigger Upgrades For MK18

The guide outlines some of the best trigger upgrades for MK18 at different price ranges. This include two stage and single stage triggers.

While the stock triggers designed to meet these specifications often have heavy-pull weights as much as 9 pounds for safety reasons, and the purpose of these aftermarket triggers are to provide crispier trigger break, shorter reset, shorter trigger bow pre travel and faster split time. 

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Best MK18 Trigger Upgrades

single stage flat trigger

Geissele Automatics Super Semi-Automatic (SSA) Trigger

geissele SSA trigger
  • Type: Two-stage
  • Pull Weight: 3.5 - 4 pounds
  • Bow Width: 0.29 inches
  • MSRP: $230

The Geissele Automatics Super Semi-Automatic (SSA) trigger is a renowned option among MK18 shooters. This two-stage trigger offers a pull weight of 4 lb, providing a consistent and reliable shooting experience. 

Its full-power hammer spring ensures reliable ignition with various types of ammunition. For those seeking a lighter measured pull weight, the Super Semi-Automatic Enhanced model is available with a pull weight of 3.4 pounds.

The SSA trigger has been certified for safety by the Naval Surface Warfare Center Crane and is trusted by Special Operations troops. Constructed from high-quality tool steel, the trigger is non-adjustable and features sear surfaces cut by a wire EDM machine for precise performance.

Brigader Manufacturing Single Stage Trigger

Hiperfire Eliate Trigger
  • Type: Single-stage
  • Pull Weight: 3.5 pounds fixed

The Brigader MFG single stage trigger features internal anti walk set pins to fully secure the drop in trigger group inside the Daniel Defense MK18 lower receiver, and it features a nice crisp 3.5 pound single stage trigger (Non adjustable). The performance is as good as the Geissele Dynamic 3 Gun trigger at half of the price.

They offer flat and curved trigger bow.

Rise Armament ICONIC

Rise Armament ICONIC
  • Type: Independent Two-Stage
  • Pull Weight: 1 pound (first stage), 2 pounds (second stage)

The ICONIC trigger from Rise Armament is a two-stage trigger that offers a 1-pound pull weight for the first stage and a 2-pound pull weight for the second stage. This trigger design features two separate trigger bows to make the first stage trigger wall feel more distinct and consistent.

For MK18 shooters that want an unconventional trigger upgrade, the ICONIC trigger provides a crisp break and a short reset, making it ideal for precision shooting as well as point and aim shooting.

Patriot Ordnance Factory Drop-In Trigger System

pof drop in trigger
  • Type: Single-stage
  • Pull Weight: 4.0 pounds
  • Bow Width: 0.29 inches

The Patriot Ordnance Factory (POF) Drop-In Trigger System is a straightforward and simple-to-install option on any MK18 builds. This single-stage trigger offers a pull weight of 4lb with clean trigger break without excessive pre- or over-travel.

However, the return stroke during the reset might feel a bit scratchy.

The trigger bow of the POF system is less rounded compared to others, featuring noticeable corners. The trigger itself is nitride heat-treated and comes with KNS Precision anti-walk pins for enhanced stability and reliability.

Rock River Arms Two-Stage Match Trigger

rock river arms ar15 trigger
  • Type: Two-stage
  • Pull Weight: 5.5 pounds
  • Bow Width: 0.29 inches

The Rock River Arms Two-Stage Match Trigger is an economical option suitable for match shooting. This trigger features a two-stage design with a heavier first stage but a clean and crisp break in the second stage. The reset is on the longer side but remains distinct. The pull weight is measured at 5.5 lbs, which may be heavier than desired for some users.

Timney Triggers AR-15 Competition Trigger

timney ar15 competition drop in trigger
  • Type: Single-stage
  • Pull Weight: 4.2 pounds

The Timney Triggers AR-15 Competition trigger is a drop-in, single-stage trigger that offers a pull weight of 4.125lb. Installing this trigger is hassle-free, with set screws securing the trigger and hammer pins against the lower floor.

The trigger provides a crisp break with no take-up or over-travel. It may exhibit a hint of travel during the single-stage pull, particularly if the shooter applies deliberate pressure. The reset is positive and relatively short. The trigger bow is very flat, and the corners may feel slightly sharp.

Wilson Combat Tactical Trigger Unit

Wilson Combat Ar15 trigger
  • Type: Single-stage
  • Pull Weight: 4.0 pounds
  • Bow Width: 0.29 inches

The Wilson Combat Tactical Trigger Unit is a drop-in trigger system that offers a great single-stage feel. It eliminates any take-up, providing a crisp break with no over-travel. The reset is relatively short and distinct.

While the trigger is rated at 4 pounds, individual triggers may have a lighter pull weight. Springs on the bottom of the cassette maintain trigger tightness. The trigger is made of solid bar stock and features steel bushings for the hammer and trigger pins.

Additionally, the hammer includes a half-cock mechanism reminiscent of Wilson's renowned 1911 pistols, adding an extra measure of safety. The package includes replacement pins.

LaRue Tactical MBT-2S

LaRue Tactical MBT-2S trigger
  • Type: Single-stage
  • Pull Weight: 2.5 pounds first stage - 2 pounds second stage
  • Bow Width: 0.29 inches

The LaRue Tactical MBT-2S is widely regarded as an exceptional trigger available at an affordable price point. This two-stage trigger offers a remarkable shooting experience with a sharp and precise break, coupled with minimal overtravel. Installing the MBT-2S is a breeze, and it serves as a significant upgrade over standard triggers, making it an excellent value proposition in the AR-15 trigger market.

Each MBT-2S trigger package includes a set of "heavy" springs, which can be used to increase the pull weight to 6 pounds. This feature caters to shooters who prefer a more robust and duty-style trigger pull. The LaRue Tactical MBT-2S trigger exemplifies the commitment to quality and performance that has come to be associated with the Daniel Defense brand.

ALG Defense Quality Mil-Spec Trigger

  • Type: Single-stage
  • Pull Weight: 6.2 pounds
  • Bow Width: 0.29 inches

The ALG Defense trigger is the most affordable trigger upgrade for the MK18 before moving onto something more expensive.

Similar to the ACT trigger but without the slick coatings, the Quality Mil-Spec (QMS) trigger offers a marked improvement over stock triggers. It provides a cleaner break with minimal over-travel with about 6.5 lb trigger pull, although some creep is noticeable. 

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