Did you remove the stock bearing plate when you took off the wood stock?
, Part # 60... many plastic stocks don't require the plate to be in place and are molded to fit without it, I don't know if this is the case with the birdshead stock but it might be worth checking.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.