My Charlotte R 51 would not eject a full mag. Eject button would not depress from either side. After reading about trimming the length of the plastic part at the top of the magazine assembly I decided to give it a try. Using a dremel with a large grinding stone I was able to remove approximately 1/16"
from the bottom of the component. After reassembly a fully loaded magazine will eject and it also functions in the 7 + 1 mode.
It took only a couple minutes to make the change. Thanks to all for the background info, it fixed the one complaint I had with the piece.