Kays Airsoft reviews and tests the E&C EC25 MCC -GEN.4- S-AEG that comes with the Begadi CORE EFCS. This has an adjustable  speed trigger and ambidextrous operation.  It is supplied with Deans connectors and features a quick spring change system that is typical in AEGs nowadays... "This time I am testing the new E&C EC25 MMC S-AEG in the 4th generation. This weapon is factory tuned by Begadi."