No, Airsoft is not illegal.
BRANDISHING WHAT LOOKS LIKE A FIREARM IN PUBLIC THO..........
To be honest, what the fuck were you expecting to happen when?
The officer had reasonable enough grounds to confiscate your & your friends AEG's, They shouldnt have ever been out in a field. Designated fields only.
Hope ya learned a valueable lesson from this whole situation, Your lucky you didnt get shot.