The M-60 free gun in the right rear of the OH-6A was almost always supported by a bungee or a canvas strap. Observers in the front left seat (when flown W/O the M-27 carried either a short 60 or a M-16. The 60 was heavy and as I said, almost always supported or secured to the aircraft on a sling or hinge mount through the door in the upper forward portion of the door frame. Most gunners fired it with their left hand which was more practical. Ammo was a smoke grenade box with about 2000 belted 7.62
If you need shots, email me and I would be glad to help.
Hugh Mills, old 6 Driver, occasional gunner