Note the loading procedure with cover down. This was how belt-fed weapons were normally loaded. Given the M60 lacked provision to automatically align the feed cam lever, keeping the cover closed insured this was never out of time with the bolt.

 

At 2:45 in the video is a demonstration of sustained fire with a M122 tripod and T&E. Note the bipod works as a handle to remove and handle hot barrels.

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