I have tried every set of screwdrivers close to the size and can’t seem to break that little flathead screw free. Any one had the same issue before while trying to yank out that screw? Please share what you did to make that sucker come off the gun.

Why do you want to remove it?
I just got a side saddle that has a replacement screw for the ejector screw to mount to the gun. But ya it would not budge
Nice set up , just need a limbsaver recoil pad for the magpul CTR and a Endine recoil buffer , although , I think somebody else is making the recoil buffer now , not Endine .
thanks for the tip. Didn't know there were better recoil pads for the CTR from aftermarket manufactures. I think Mesa took over the enidine line of recoil buffers though. Can't tell from just the picture if it is proprietary to their stock adapter or has the same thread size as a proper Mil-spec AR buffer tube. hmmmmm
You're welcome , I've got the Endine one with a Mesa adaptor , the tube itself is Mil-spec , the threading on the tube is the standard one used on ARs , so any AR buffer tube will fit , mil-spec or commercial tubes will fit .
And the Limbsaver pad is very soft .
ht tps://limbsaver.com/collections/firearms-gear/products/magpul-stock-recoil-pad