Rather than buying a set of stamps, many of which I'll probably never use, I'd rather just buy the ones I need for my AR builds. Starett is a very good brand to have in your tool kit. Stay away from cheap junk! Sizes with a 5/32 taper tip, 5/32 drive pin, 3/32 taper tip, 3/32 drive pin, 1/8 taper tip, and 1/8 drive pin are a good place to start. I seem to be missing a pin on the barrel's gas block. But I'm by no means an expert. The dimensions above are a pretty good start. Happy building!
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