I'm really lazy when it comes to cleaning my guns. My Witness 10MM has had ZERO problems, even with my lack of care. I just throw a little lube on it now and again and it's just fine. I generally average 500 rounds before I give my guns a good cleaning. I think my H&K USP Tactical is probably the most finicky as far as cleanliness, but even then, it ain't that bad. Actually, my DE in .357 is the most finicky as far as cleanliness.