Abstract: A marksman may quickly establish the correct vertical elevation of a firearm resting on a firearm forestock support plate by providing a platform having supports adapted to rest on a surface; hingedly supporting said support plate rear end to said platform; and adjusting the elevation of said support plate front end by rotating an eccentrically mounted support member. The orientation may be adjusted by providing a stop bar depending from a front end of said support plate; mounting a rear end of said support plate for horizontal rotation with respect to a platform; and urging said stop bar to rest against either a first windage screw advancing from one side of said platform or a second windage screw advancing from the other side of said platform.