Thinking about converting your H&K USC into a UMP, these rear stubs are a must. They are factory H&K German made. These came from de-milled H&K UMP45s. Includes is folding stock, stock pin, rear stub/cut receiver, rear sight, and front section with front sight. These are used and will have scratches and dings. Sold as is no returns/exchanges. All sales final. Item pictured is representative of one you will receive.