Mud Test: H&K 416/MR556
This guide details the H&K MR556A1 mud test as performed by Karl Kasarda of InRangeTV. It covers two scenarios: a closed-action test where the rifle performs well, and an open-action test where it fails. The guide also includes techniques for clearing malfunctions, such as rinsing with water and 'mortaring' the rifle. Kasarda, a recognized expert in firearm reliability testing, provides an analytical assessment of the piston system's performance in extreme conditions compared to Direct Impingement systems.












