They are pretty strict on FPS for indoor play. If your gun chronos higher than 350 you won't be able to play. They may make you bring it up to tech to try and lower the fps.
The MAX FPS is 350 no exception
You'll have to be able to shoot under 350 with .20, for a barrel that length I recommend getting an RA Tech NPAS nozzle. It will allow for adjustable fps
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