Ok, thanks. I don’t really know how the strength is affected by machining. Metallurgy is kind of a black art to me. I’ll have a look at the drilled bolt information. Do you know of they heat-treat anything to improve the strength?
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Cake day: February 2nd, 2026
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Thank you so much for this information. It has always bothered me when metallurgy isn’t part of the discussions.
The Dirty Harry is designed for 8 mm liners and has no provision for adding an external sleeve. Fortunately, I can’t get barrel liners so will never test it like that. The DH does include a Proto Barrel design which accommodates a 10 mm OD tube which more closely matches the McMaster 3/8 inch tube which I think would be safe.
12 mm OD tubes really do seem to be the most readily available. I’d feel comfortable turning down 12 mm to 10 mm on a lathe, but you’re correct, 8 mm seems way too thin. It could be done with a steady rest, but I’d be worried about the pressure.
I’m really not a fan of buttons, I think ECM is much more convenient.