I would have to say the Savage 20 ga pump I had that everytime I pulled it up to shoot it, the slide button would release, and the slide would unlock. Second would be the 37 Ithica pump I had. It would Double feed and completely jam up the gun, had to remove the barrel to clear it. When it did function properly, I couldn't hit well with it.
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Good shootin to ya
Plateshooter
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