fixed fgc9 buffer tube plate

thingiverse

The mount plate has been modified, where buffer mount to upper and lower the plate was to thick allowing a gap between upper and plate. Thinned material on plate to close gap. I added MY version of mil spec buffer to the fgc buffer plate for use with mil spec braces. i wanted to be able to use a wider range of brace designs. I think it turned out ok for a tinkercad level put together. Feedback would be great for improvements or thoughts.