dear all
can you help tell what is the difference between them?
I read bad mojo site, see that mean street about almost the same with active duty. except the blade thickness.
is it true?
can how about meaner street and heavy duty? what's the difference between them?
further more.how are they grinded? 
I know the thickest version of active duty(off duty) is hollow grounded ?
then how about others? from what thickness it turn to be hollow grind instead of flat grind.
I am only a newbie. thank you for your help .
can you help tell what is the difference between them?
I read bad mojo site, see that mean street about almost the same with active duty. except the blade thickness.
is it true?
can how about meaner street and heavy duty? what's the difference between them?
further more.how are they grinded? 
I know the thickest version of active duty(off duty) is hollow grounded ?
then how about others? from what thickness it turn to be hollow grind instead of flat grind.
I am only a newbie. thank you for your help .