I made a front sight adjustment tool today. I'd had the front sight soaking in Kroil for the past two days. The lock screw came right out. My sight adjustment tool took 3-4 modifications before it fell into place. Again, Kroil had done the trick. Screwed the sight right out. Got it cleaned up and put back. Dissassembled, cleaned and reassembled rifle. Now, I'm just sitting back waiting for the magazine follower and spring to arrive from Numrich.