I am curious about how often, those that have them, give their Nylon 66's a good deep cleaning? I have one that I bought in the late 70's, used. It is a patent pending gun. I took the receiver cover off and the barrel out for the first time since I owned the rifle and cleaned it. I was amazed at all the grunge I found in the receiver area. Even with all the dirt the gun never skipped a beat.