I'm sure this has been covered before but I've discovered (or re-discovered) how to take the slop out of 6 position stocks. Using Devcon Plastic Welder, I put a smooth thin layer inside the tube receiving end of the stock. Remember that you can always add more later if it is too thin, so don't go overboard. I only went about 1-1/2 in and avoided getting any in the square channel at the bottom. I made my applicator out of a used jig saw bit, using a grinder to smooth out the edges. After waiting for curing, I wrapped a piece of 180 sandpaper around a short stick of 3/4 PVC pipe. I slowly sanded the inside surface while occasionally testing the fit on my buffer tube. If there are any high spots, the buffer tube will indicate this by scraping it up when you push on the stock. Carefully sand these off avoiding the areas that are already fitted. I doubled over a small piece of sandpaper for my index finger to do this. Once everything is smooth and carefully fitted, your stock should slide on, slightly tight but not too tight to prevent adjustment. No wobbles here!