there is only one way to know for sure your weapon wont break and that is to use your sparkcash to buy the red eyes from the OS store. there are 3 different eyes. red blue and gold. red makes sure that your weapon doesnt break if it fails. blue makes sure your weapon doesnt downgrade if it fails. and the gold ones increases the chances of your weapon enhancing by 15%. good luck enhancing and becoming an enhancment god. like me