The Blue Force Gear M16 Buttstock Adapter is a versatile accessory designed to enhance the functionality and comfort of your M16 rifle sling. It provides a solid platform for attaching various accessories, such as cheek risers, butt pads, and sling mounts. The M16A2 Buttstock Adapter provides a sling attachment point on top of a M16 A2/A4 buttstock. This keeps the weapon right side up during carry and prevents the weapon from dangerously flipping upside down.