Rescently acquired 2012 Buckmark preowned 99.9%. I have a challenger III, so I thought disassembly would be the same. The factory put LOk-Tite on the barrell screw. I called Browning and they insisted I don't take the gun down, Just oil it don't even squirt Gunscrub in it. I don't agree with this. I never had an autoloader that I shouldn't take down. Is this reasonable advice, or do they want to CTA in case I f**k it up?