So I recently purchased this rifle from a women whos husband had died about 5 years ago. Outside of the rifle looked good and at the time I didn't know how to remove the bolt to inspect the barrel. When I got it home and did some research I was able to remove the bolt and look down the barrel to see a very rusty crusty mess. I'm guessing before her husband passed he fired this with some corrosive ammo and never got to clean it or just purchased this way. Luckily I have a very cool gunsmith of a neighbor who lets me use his stuff and teaches me along the way. I cleaned this for about an hour using amonia based solvent at one point and this is the result. After the bore scope it spent another 30 minutes soaking in Bore tech eliminator solvent that removed alot of that copper and got brushed out again and oiled up with kano kroil for now. Patches surprisingly were almost clean when we finished for the night. Gunsmith neighbor thinks bore should be ok to fire now but we are waiting on headspace gauges to come in to make sure the chamber is ok as that concerned him. Luckily the seller is going to make things right on the price and either give me some money back or hook me up with some bayonets for my 2A1 I also purchased from her. From what I have read these cleanup nice after firing a few rounds through them.