Don’t know about RFC but I have a Glenfield Model 25 from the mid-60’s that is in many ways similar to the OP’s Ranger.
The magazine looks identical, having a release push tab on the bottom back of each mag. No knurled takedown knob on mine. Back end of my bolt is rounded and my rifle has the grooves for a scope mount on receiver. I purchased three extra mags way back, seems they were $3.00 each.