Low Nitric Oxide Levels Many guns come from the manufacturer in bad shape with regards to internal over greasing and dirt. Nothing that may not be solved with silk cloth and cleaning rod. Problems start once the gun can not work properly after overall cleaning process. Many manufacturers declare inside their relation to warranty, that any interference using the guns original state can cause your warranty annulment. Being responsible and doing a bit of research on disassembly process (manufacturers info ought to be the starting point) is priority, every incompetent handling with the gun can bring about permanent damage and cancelled warranty means no refund, right? If you aren't certain of the way to handle the disassembly and cleaning process, always employ specialized services.