This guide details the complex calibration process for the Heckler & Koch Ziel Punkt Projektor (ZPP), a rare 1970s aiming device. Expert Ian McCollum demonstrates how to use a specialized tool to align internal filaments via rear adjustment screws, ensuring the projected aiming circle and dot are correctly focused and sized for effective low-light aiming. Proper calibration is crucial for the device's intended function on HK 90-series rifles.
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