Oh WOW! That's exactly what you have! https://www.savageshooters.com/conte...They-Do-Exist!

Yeah, from a custom build standpoint, you're better off selling as is & going the standard Steel 110 route. But from a Savage collecting standpoint, you have a very rare piece indeed. The article I posted even touched on the perceved notion that NO Integral Lug Cast receivers were ever issued to the public. So, you may very well have a SINGLE specemin if it's kind. Pretty cool.