Tom's Airsoft Channel reviews the CYMA CM131A Gen 5 AEP with Begadi upgrades. It's loaded with features such as the Begadi CORE EFCS/Mosfet, Begadi PRO CNC Hop-Up, and Begadi AEP Balanced Hop-Up rubber... "Today there is again a small but very fine part. The Cyma AEP series in the Gen 5! Absolute hammer these parts but see for yourself."