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Gunplummer;
I thought about cannon breeches too, but didn't mention them. You are correct, in that the threads are used if you want to make something easily removable. Military rifles are meant to be torn down, by armorers, and fixed, or new barrels re-fitted, and that may happen several times during their tenure with the military. I would say that was the original thought at the time, but later, everybody standardized on the V thread. A long time back, in the 1920's and before, there were a whole slew of threads being used that we never see today.
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