If the bolt closes OK with barrel pushed back, but drags when barrel is in its forward position, I would think the problem was caused by mismatching bolt lock (the internal steel block) and bolt. Both were numbered parts on Bolo Mauser. I met a few Mausers pushing back barrel and releasing it, the barrel does not automatically return to battery, and all of them were caused by either mismatched bolt lock, or fake matching bolt lock. None by weak springs.
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