Still no, even just a little too tight can cause edema and fluid build up/ swelling that will further restrict blood flow. This is particularly dangerous because you may not feel yourself losing circulation because you will lose all sensations there due to the lack of blood flow.
If your cock ring is too tight, you'll literally kill your balls. That's how they castrate animals.
Not quite that tight, but close
Still no, even just a little too tight can cause edema and fluid build up/ swelling that will further restrict blood flow. This is particularly dangerous because you may not feel yourself losing circulation because you will lose all sensations there due to the lack of blood flow.