It was sold to me as a Citori stock, but I'm not sure of that. Looks like it'd be for a 12g before a 410.

The stock has a Carey comb recoil reduction unit installed. Yes it is for a Browning product. Allison & Carey Gunshop in Portland, OR should have some better information. Don left Oregon years ago and the last time I heard of him he was living in Idaho. You are missing the comb,hardware, buttplate, recoil reducer assembly from the picture. Don was advertising in a magazine related to the shotgun sports. I can't remember it's name just now.