Griz I just got back from town buying the Patch out Accelerator, I haven't used it yet. Yesterday I had a very slight trace of Copper fouling after I had tried Patch out for the first time I only let it sit for 30 minutes. Today I decided to try Patch out again and let it sit for 3 hrs or so while going to town. Got back and ran 3 patches thru the bore on this trace Copper fouling 1 st patch slight tinge of blue , 2 nd patch totally white, third patch for good measure totally white, 4 patch Alcohol only to get rid of any remaining Patch out. Took the bore scope out AMAZING no copper at all. Bore is in pretty good shape for as many rounds have been shot thru it. Tslong does make a 26 " rigid tube for about double the price $ 138 bucks give or take. I mention this only because with the flexible tube like I bought I can use the scope for other non firearm inspections otherwise the rigid tube for firearms would probably be a better way to inspect, either way you have to rotate the tube in your fingers to match up with the rifling twist of the barrel itself while inserting farther down the barrel bore which is OK I's kind of how you would have to inspect anyway. I inspected my old 96 Mauser in 6.5x55, OMG the bore looks like it had been sitting in salt water pitted, corroded, rusted, copper fouled, and everything else, but I knew this when I bought the rifle years ago, it's over a hundred year old rifle that has seen who knows how many corrosive rounds thru it and it still shoots sub-moa with 140 Bergers. The these old military rifles have grooves that I'll bet are .010" deep so the bullet has a lot to grab on to and not doubt why it still shoots. If this bore scope lasts a year it will be money well spent. I did try to download the App to my Android Phone, no luck, but the screen on my computer is way better anyway which I have it set up with. That Patch out is well worth the money and a lot less work, I didn't try it on any really fouled bores but first impression it's going to do just fine IMO, The Patch out Accelerator haven't tried yet. One thing about this bore scope you can take the 90 degree mirror off if you want and look down the barrel , and get a over view , put the 90 degree mirror angle back on which you need to get down to the nitty gritty of your inspection. I spend 60 bucks on just BS stuff that has little to no use other than it might be a good steak for the wife and I. I really like being able to actually see the bore