The last part of your rifle to touch the bullet after the trigger is pulled is crucial for long range accuracy and the life span of your rifle. First what is the crown: the very end of your barrel, and the easiest part of your rifle to get soiled in the field. To protect your crown you must do you best to keep it free of moisture and dry if water is contacted. Secondly when cleaning never insert the cleaning rod from the end of the barrel always remove your bolt before cleaning and then insert the rod from there. This will let the brush grab the rifling faster in my experience and from what I have been taught that it will greatly reduce cleaning wear and tear on the rifle. Also if you have not shoot a lot the best way to clean and preserve your rifle is to just use some solvent on a bore snake. This should be run through the rifle 2-5 depending of how well it cleans the rifle.