Relevant contribution to this thread; I had a very unfortunate mishap w/my SS Match. After a trip to the range I began to take down the Match, and then was faced with a stuck screw on the barrel weight!

After some sad attempts to remove the screw with my allen wrench (of the correct size), I finally had to resort to a screw extractor. I found that the combo that worked well for me was a 5/64 pilot hole and then a #1 screw extractor. Tap the back of driver to get a bite into the screw, and then remove. Here are the results:
It worked, but now I have a trashed screw. Anyone know where one might find a replacement of this size in black? Also the thread pattern just in case I find some online? Tried Adam with no luck.