I recently bought this 92FS and have taken it to the range twice. This last trip I put about 100 rounds through it and had a slight jam where the slide didn't drop all the way down. This happened when my wife was shooting the pistol so I assumed it was a limp wristed posture that did it and it kept shooting fine after. When I cleaned my pistol that evening, i noticed the retainer pin in the locking block was exposed a bit and sheared (maybe 1/16 inch?) though i found no debris during cleaning.

Is this common, or does it indicate this pin isn't staying put as it should? I have pics but I couldn't figure out how to insert them into this post.