GT Custom Airsoft undertakes an upgrade of an AK using 5KU replica Zenitco parts. The upgrade process begins with the installation of the PK-3 grip, which is renowned for its high-quality fit and finish. A unique feature of this grip is its waterproof storage compartment, providing a practical and secure space within the grip itself. All necessary markings are meticulously included and laser-etched onto the pistol grip, ensuring authenticity and attention to detail. The upgrade process is further enhanced with the installation of the RP-1 charging handle, rounding off a comprehensive and quality-focused upgrade.