Could not find under search so I will ask. I only discharge maybe a box 57 every two weeks. How often would any forum member clean the 57, based on my limited use. I tend to wait until I have put say 200 rounds thru 57, which comes out to every 2 months and have had nada problems and have not seen any real buildup of discharge residue. I should add that I use Balistol for cleaning and lube, based on an email comment from an FN tech. Any negative comment other than smell.