@Ryne Thank you very much, I am doing my best to share more fun to EC community, which can mean that this will not be the only event, but maybe some others will be organized in the future,
About your question, at the beginning of the event's allowed weapons, there was no heavy weapons nor rifles. But some players proposed me to add a weapon to avoid the "run" of players. Assault rifles were not added because of its 1tap fatal power, beside the fact that some players have advantages with their mouse software over some others that have old/bad mice. So the reason to disallow rifles was to make the fight equal to both sides.
Now here comes the answer to your question about "why allowing heavy weapons" or the "M60": The reason is like I said, it was added to make the death of players who run all the time easier. As M60 is a heavy weapon, none will use it in a close range in general, And I already thought about the Hp that can reduce, that's why I planned to set both players Armour to 100 so players don't die fast. And also m60 is not that easy to handle for its slow motion which can also be a disadvantage for players who use it continuously.
If a player runs around to escape death, the other will have rights to use m60 on him, which means that it is unfair for the one who is trying to escape because he is still not allowed to use it unless the other is also running around. So it's really hard to make such a rule although it's a good suggestion
I hope you got the reasons for adding m60 and disallowing assault rifles