Geissele: HK MR 556 Trigger, 2 Stage, Curved Bow

Geissele Triggers
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The HK MR 556 trigger is similar to the SSA Trigger and can be used in both the HK 556 and semi-auto HK 416's. 



  • Type: 2 Stage

  • 1st Stage Weight: 2.75 - 3.0 lbs.
  • 2nd Stage Weight: 1.5 - 1.75 lbs.
  • Total Pull Weight: 4.25 - 4.75 lbs.
  • Adjustable: No
  • Recommended Use: Law Enforcement, Home Defense, Hunting
  • Pin Size: Mil-Spec


After installing the MR 556 trigger you must cock the hammer in order to engage the safety unlike the HK trigger system where you can place the selector on Safe with the hammer forward.