Old guy that is new to this 22 world looking for a little information. Not long ago I purchased a Ruger 10/22 from Gunbroker.com. This is a stainless model that had been sent to CPC before I ever bought it. It has Kidd internals with a Timney trigger. The only thing that is actually Ruger is the receiver housing. After running a few hundred rounds through it I took it apart for a good cleaning. The thing that strikes me as odd is it appears as if the insides of the receiver have a thin coating of mylar, kind of like scotch tape. Just wondering if this is normal?? Was thinking of maybe buying a Kidd receiver to go with the rest of the parts. Would like something that is steel or at least tougher aluminum than the Ruger stuff. I added the Timney Calvin Elite trigger and a Lilja barrel. Shoots pretty good but the receiver and this flakey material it has on it sure seem strange to me.