Recently I had a 1903-A3 that came through my shop and the rear receiver screw was a 1/4-25. Definitely a non standard. Fortunately they are still somewhat available.
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Metric Thread Forms in U.S. Martial Arms
- Thread starter Rokon
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I was taught that the Swiss STARTED to develop metric threads in the late 1800s, and it took years before any standardization.
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1757 Spanish Infantry Musket - NOT India Made
