Old Post is one of the original AGC clubs, first known as "Marine Post No. 1, American Legion". Founded by veterans, this club has been continuously a NRA member club since 1951. Club was later renamed to Old Post Rifle and Pistol Club, and opened its membership to all NRA members. Old Post helped in building AGC facilities (100 yard Barnes range is named after the late Old Post member and past AGC president Fred Barnes).

   Club members currently shoot trap, pistol, sporting rifle, and muzzleloading rifle on a non-competitive basis (unless members are interested in competitive shoots). Club membership is small (currently 23 members), and its membership is limited to 50 by its bylaws. Old Post is a relaxed, social gun club with a core of knowledgeable senior members.