Rom Airsoft reviews the review of the VFC Avalon M4 URG-I AEG, shared by an experienced player named Galvan who has owned the replica for nine months. He initially intended to use a different brand, but after seeing a friend's Avalon outperform his previous setup, he made the switch. To ensure longevity and adjust the rifle for local power regulations, several internal modifications were made, including upgrades to the piston, piston head, and cylinder head to reinforce a somewhat fragile stock gearbox.