For me, hands down it was a "60's" production Mossberg pump 20-gauge. I was about 12-13 when my dad bought it. I thought that I was on top of the world until I put it to use. Never have had a gun, before or after, that would eject live rounds out of the bottom of the loading gate. Pissed me off every time!! The old man blamed it on me, but I did nothing but try to rack a round from the magazine to the chamber. The gun shot well as a single shot, but never as a repeater. I finally had enough and "lost it." The old man never believed me.
RIP old Mossberg....hope you rust in hell.