Saw this when I was looking through some vintage WWII photos. Not sure if it was ever posted here before. Looks like a vertical fore-grip modification. No clue if this was a field expedient, or some were modified and shipped out this way.
Iwo Jima BAR3 (2).jpg 79.91K 44 downloads
Close up of same photo.
Iwo Jima BAR3.jpg 27.68K 49 downloads