Learn how to do a proper upgrade of an E&K AK AEG in this video by Airsoft Tech... "In this video, I show you step-by-step how to upgrade an E&L AK replica to get the most out of it on the field. We discuss the internal components, recommended adjustments, and key upgrades to achieve greater accuracy, range, and reliability. After the upgrade, we move on to shooting tests to verify the results in the field: velocity, grouping, and overall performance."