M14 takedown problems

Trying to remove the receiver from the stock, I looked up how to remove it and this last screw literally will not come out, it's the screw right in front of the mag, and it just sits in place as I constantly turn it left, it will go left and right and just not move up and down, was it stripped during manufacturing? Its annoying cause I want to paint this guns stock given the weird brown color on the plastic that looks Nothing like wood (winchester/daisy M14 air rifle) am I doing something wrong? Any solutions or am I just screwed