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Heh, actually fellas (and this is going to throw everyone off) it's neither. It's AND/OR according to the CFC.
The joule limit was introduced in response to ultra-light lead .177 cal pellets that when used in an otherwise normal airgun, suddenly caused it to shoot faster than 500 fps. Here's my non-lawyer interpretation of the and/or modifier. Under normal circumstances using projectiles of "typical" weight (whatever an average .177 cal pellet weighs) or heavier, the OR modifier is used as you do not want someone pushing a heavy bullet past 500 fps or beyond 5.7J if it's heavier than average. For light projectiles such as the ultralight lead pellets (and therefore by logical extension, airsoft guns), the AND modifier is used as you can easily push a lighter projectile beyond 500 fps but not be breaking the joule barrier.
In summary, if they added this joule limit in response to light lead pellets it was done to avoid classifying firearms shooting light projectiles >500 fps as firearms. Airsoft pellets are even lighter still, ergo it should be 500 fps AND 5.7J.
Grain of salt not included.
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