Probably where Harrison obtained his information from. War Baby is not without errors. War Baby has not been revised for sometime and is due for some needed updates. The best source for updated information is the Carbine Club. They have ongoing data and years of data sheets. Rock Ola used a one piece stamp. You have a nice desirable 6 million Rock-Ola. Your stock while made by Rock-Ola, was not used on original Rock-Ola mfgd. carbines.