The thin bit set from Brownell's has most of the sizes you need. You do have to be carefull when selecting the width of the blades, if they are too wide or offset in the slot you can bugger up the edges of the hole. Alot of times you see guns with a slightly raised edge around the screw holes or the screw head looks too small for the hole after you put it back. I like to be able to see a little space on either side of the blade in the slot, and if you are really fussy you can break the sharp edges off of the blade with a good file to help prevent this from happening.
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