BT, excessive wear and tear always plagues airsoft population in coutries with high FPS limit. People live with that by swaping pretty much everything right out of the box. That's what happens back home. Limits go up to around 550FPS there. Another thing that players from old country implemented is special rules for support weapons. LMG's have higher minimum engagement distance and higher FPS than regular AEG's.
I'm not sure about V2 boxes but V3 CA and VFC shells can handle 450 no problem.