The Crafting-system has been bugged for along time already.
After talking with a Developer, it was told that the maximum quality is set at 300 for all crafted items.
But because of the bug, the players can exceed this maximum very high.
Some people are walking around with weapons, that have a quality of 4000/50.
The cheating part is, that how higher the quality is, the higher damage you do to others.
The GM-team will get some updates, that will give the option to view the stats of a weapon very quick.
When very high boosted weapons are found, they will be removed and destroyed.
And crafting or using those weapons is seen as abusing the bug.
And everyone knows, that abusing a bug is considered cheating.
It will be up to the Developers, what will happen, when the bug is fixed.
Most likely the crafted weapons can be wiped or stats are lowered automatically.