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Thank you guys so muchThe black cloud over the so called low number 1903's existed because of a perfect storm of improving ammunition and the associated higher pressures and the imperfect system of heat treating that relied on eyeballing temperatures. What they found was that the difference in color of the red hot receiver between a sunny and cloudy day could be the difference between a perfectly he treated receiver and one that was possibly too brittle.
When the problem was discovered, they change systems and solve the issue. Springfield Armory does not have an exact serial number where this change took place. It was somewhere north of 800,000. Rock island armory actually have the exact number. I believe it was around 238,000, but I can't remember exactly. It is easy enough to look up. Chances are any low number rifle is likely safe to shoot, but there is just no way to tell if the rifle is a ticking bomb. So most people choose not to shoot them, shoot low pressure reloads in them, or just hang them on the wall. The CMP does not allow them in any competitions (low number rifles that is)...
I guess I never really considered it a black cloud, more simply growing pains. But I get where you're coming from with the black cloud comment.
I still love them. In fact I think the most beautiful rifles are the very early models with the sarif font writing on them. I only wish it was safe to shoot.
You clearly know your milsurp weapons.