Add weight to your GEN 1 Magpul UBR adjustable buttstock with this lead weight. The weight fits snugly inside the triangular cavity in the center of the stock. It adds almost a pound (15 ounces) to your UBR stock.
The weight ships with a piece of adhesive foam which can be applied to one side of the weight to ensure a snug fit and eliminate any rattle or movement.
Note: To take maximum advantage of the available space in the cavity the weight is installed by removing the panel on the left side, inserting the weight and replacing the panel. The hinge interferes if attempting to install the weight through the hinged opening on the right side.