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~~~ You might also try emailing or calling Baker Airguns. They deal a lot with older guns and parts and might know when the change was made:https://www.bakerairguns.com/contact-us/
Hello, I've noticed on one of my 25 the pump anchor is welded with two round spot welds on each side while anotheris welded with one oblong weld on each side. Is there a date when the type of welds changed? I'm trying to get a better date of production on these guns. Thanks, Jim