This stock adapter for the semi auto M10/9 or M10/45 gun will allow you to use a stock or brace that uses the 1913 Picatinny Rail spec. The stock adapter is made of carbon steel and parkerized in the traditional finish of the MAC series machine gun and comes with stock lock which secures the stock adapter firmly into place.
Note: This stock adapter will not work on Full-auto guns. Click here for the Full-Auto Stock Adapter. It is illegal to put a stock on a pistol, the semi auto must be registered as a short barrel rifle in order to make it legal to put a stock on it. The Sig straight stock will fit on the M10, however the Sig folding stock will not fold and lock up correctly due to the stock adapter being too wide. Stock not included.