Abstract: An adapter brace device (10) for removably fitting onto one end of a policeman's side handle baton (12) for bracing a handgun while the baton itself is used as a shoulder stock. The adapter device includes a round, plastic body portion (14) with an inner end (16) and an outer end (18). The inner end (16) of the body (14) includes a recessed opening (20) and the outer end has a cradle portion (28) which angles upwardly and outwardly and which cradle portion has a concave depression (26) for receiving the back edge of the grip of a handgun (G). The adapter brace fits on to the end of the baton as shown.