A firearm supporting apparatus suitable for use with shafts of varying diameters and lengths includes an elongated support member having a clamping surface and a firearm supporting surface; a collar connected with the elongated support member; and an adjustable mechanism connecting the collar with the elongated support member and adjusting the position of the collar relative to the clamping surface of the support member, the collar and clamping surface securing the support member to the shaft. In one embodiment the adjustable mechanism includes an elongated threaded member connected with the collar and the elongated support member and a fastening device associated with the threaded member. In an alternate embodiment, the adjustable mechanism includes an adjustable clamp connected with the elongated support member and integrated with the collar, which is a flexible band.
