The Turret Monster has eaten a lot of M-16s.
The ‘turret monster’ was a M-60A2, that was quite cramped. My battery commander and the tank company commander agreed that I would draw a M-1911 from the tank company armorer whenever we went out on alerts or training on the M-60A2 that was my forward observation vehicle. I really liked having the azimuth indicator and laser range finder when we did polar plot fire missions. And the armor of the A2 was a tad thicker than my regular jeep, although I was the only tank in the company that had 3 antennas.