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McMaster-Carr stocks screws and wrenches.
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Assuming I can get it out, how/where do I find a torx set screw to replace it with? Wonder what the size/tpi is for this little screw?
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Very few gun manufacturers have more than a single style of each screw.
Developing a drawing and finding a sub (or setting up in house) to make more than one screw style is very expensive.
You will also not find that gun screws conform to any standard sizes available from places like McMaster-Carr or other industrial suppliers.
Many gun screws are very fine but shallow threads useable in only the hardest steels with well known composition and heat treat.