The ordnance department listed all the failures that occurred and the cause. Didn't have time today to post everything but this is from 1918. So I'll post this real quick while I have a free moment today. The report in question listed all failures from 1917-1923. Among other reasons were broken bolts, bore obstructions and barrels splitting.
It's important to remember there were high number rifle failures as well as low number failures. And there were 1917 receiver failures as well as 1903 receiver failures (albeit there were significantly less 1917 receiver failures). War time expediency did play a role in quality control.
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