Quote History Quoted: I very much despised the variant I had with the "hook" on the gun- that was the original shotgun arm "brace" carry handle - It gave the worst shouldering ever in a shotgun.
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The hook can be removed when not desired for use. It can also be positioned to the left, right, or forward position. There is a spring loaded plunger in the butt, and a round nub on the hook. You simply push the hook in and rotate it 90 degrees to lock in (think of how you push and twist the brake light bulb in a car).
When positioned to the left or right (for shooting left or right handed) the hook goes under your arm to allow you to fire one handed.
When positioned forward, when the stock is folded on top of it, it functions as a carry handle.
I have one (with the hook) and while it does have it's quarks, I would not trade it for anything. Luckily mine has the updated pushbutton safety.