Used this on a custom chassis stock. - DoubleStar Folding Stock Mechanism with Integrated AR-15 Stock Interface w/o Boss

This folding stock adapter allowed me to put a Magpul precision stock on a custom chassis rifle I am building. It locks up solid and gives a fantastic cheek weld. Being able to repeatedly put my cheek in the same spot is important and difficult with a folding stock. This product makes it easy and very repeatable.