Welcome Izaak,
Nice to see you taking an interest in airsoft. I see many people already gave you some pointers but I have some to that might be of use to you:
- I saw that someone already quoted the current fps rules for you but it is worth pointing out that January 1st 2019 the rules are going to change: Instead of measuring fps we are going to switch to measuring joules. Also the standard weight for the bb to do the measure with is going to change to 0.3 gram (instead of 0.2 as it is now). On the site of the NABV you can find more information about this.
- Here in The Netherlands we aren't allowed to use grenades of any kind that looks like an explosive. In practice this means that virtually every grenade made for airsoft (and offcourse real ones to
) is illegal. There are a few exceptions: The AI tornado WITHOUT spoon (no longer in production, but you may encounter them for sale and in game) The Avatar grenade and then recently there were 2 (of the same manufacturer) but their names are terrible to remember.
It's worth to note that so called moscart or shower shells that are used in the 40mm launchers are also regarded as replica's of explosives and are also currently not allowed to be owned and/or used on Dutch soil.
- Seeing you are going to live in Groningen means you are also pretty close to the Dutch/German border and as such you might be tempted to go visit an event in Germany and so it might be handy to know that the laws regarding replica's are a bit different there and are pretty strictly enforced:
= The replica must have a few markings. They are: the caliber 6mm bb, a F enclosed in a pentagon, the name of the German importer.
= It is also forbidden to mount a light and/or laser on your replica. To be even more precise: even owning a light or laser that is made ready to be mounted on a weapon is illegal.
= Replica's may not be capable of shooting in full auto when the muzzle energy is above 0.5 joules
Hope to see you on a field someday and even if not I wish you a very pleasant life here in The Netherlands.