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Had it happen, but with an AR-15. Our barrels in particular have a thin, fairly hard coat of protectant that needs to be cleaned out before firing. It looks like rust on patches and we have had phone calls about it.
Or pic one up and shoot it. I was by no means a Glock fan. Then I had a chance to run a few hundred rounds through one. New respect. Now after over 25,000 rounds the same Glock 22 is still in business. Glocks work!