To Valcrow, I think the main point of Grey's post was that it is very easy to totally screw that one step up so he should be prepared for the worst. (The stock cylinder is probably the only good internal part on the VSR-10 though so I can't really recommend bringing in a second one just in case.)
For my own cylinder I actually took it to a shop where they touch welded a small piece of metal onto just the pin and then yanked the pin out. Much cleaner than drilling but requires special equipment.
If you are going to drill the pin out I recommend finding a micrometer to determine the size of bit you need. (I'd look it up but I'm lazy) Just keep in mind that all you only need to drill far enough to let the cylinder head rotate in the cylinder so you can remove it. (ie: 2mm at most) You definitely need a drill press though. I've seen pictures of the results of someone using a hand drill and the end result was that he needed a new cylinder since he couldn't cycle the bolt without scraping up the inside of the receiver.
Good Luck!
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