My first suspicion would be the ammo. I have seen problems with Rio ammo in other calibers, just haven't had any experience with it in 16 ga.
I think I would try different ammo before I would do anything with the weapon. When chambering the round, you have a little "run" at the chamber, but coming out you don't have that long slide of the bolt to jerk it out. It could be a rough spot in the chamber near the rear, but look for the easiest fix first, which would be ammo.
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