Hey, how have the new magpul mags worked with your RAP in the magpul stock? So far this is the only post anywhere that I have seen that suggests they work together. I have spent 6 months trying to track down a magpul hunter stock to throw onto my RAP 223 so hoping the wait hasn't been in vain. Thanks!
Late reply here, I just saw your post.
The magazines work well.
At first, they were feeding the rounds a little bit low, the bullet tip not always entering straight into the chamber, sometimes the bullet would hit the breech of the barrel just below the chamber opening.
I very carefully filed the inside of the front of the feed lips to open them up just so slightly. It worked. Now feeding is perfect. If you have to do this, just go very slowly, checking feed angle between every few passes of the file. Once you file it off, you can't put it back.