Copy it is your duty gun, but highly doubt you would use it like above. If you cannot replicate and have replaced the spring, I'd chalk it up to a fluke. I would burn some ammo as you say to reinforce the comfort level.
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Just an update for anyone following.
New spring and slide lock are still en-route, but I did shoot a little over 500 rounds, mix of 180 HST and American Eagle. Gun works as it should. :confused:;)
Does the Glock Corp have an explanation for this event? I understand that in the past such has occurred.