My brother in law's father in law was/is a certified gun looney. This guy shot varmints, upland birds, trap, skeet, small bore rifle....you get the picture. He has aged to the point of not being physically able to continue his shooting sports. He literally gave his son in law a huge amount of shooting/reloading gear. My bil knows very little about guns, so I told him I would help him liquidate the shooting stuff. I know what most of it is and what it is used for, but this thing has me stumped. Looks like a rest of some kind, but not much adjustment in it. The top is attached by a circular bearing that lets it rotate 360 degrees. All steel, excellent welding and finishing on it.
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Then you will know the truth and the truth will set you free.
John 8:32

A lie doesn't become truth; wrong doesn't become right; evil doesn't become good, just because it's accepted by the majority...Rick Warren