If it's going to be indoor I'd say you want a spring that will put you at 330fps or so (my TM M4 shoots 330-340 and works fine for outdoor too). I can't recommend an exact spring, because I don't know if the G36c uses the shorter marui springs that the M4/416s do.
As it's your first AEG, I recommend finding a local gun doc, taking the AEG to them and let them know what you want. You may have some difficulty finding someone who works on TM recoils though... I know I did. Don't recommend you try to swap it by yourself.
But first I would confirm with trigger that the spring has been changed for import - just email and ask. If it's stock then you're fine - the gun will last a long time on stock internals and perform great. If they did change it or they aren't sure, find that gun doc.
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