I thought the one I had in Nam was unique.

I was in Nam in the early years when you saw a wide variety of issued weapons. I ended up being assigned a M14A1E1. I had never even seen one before. I was with a group of about 5 guys in a paddy, when we were fired on. I just caught a glimpse of the flash, and swung my rifle up to fire of a round as we moved for cover. Hell, I had it in automatic, and before I got my finger off the trigger, I was firing nearly straight up. The Sgt hollered at me, "What the F*.* you doing, it is not a air strike! Good thing there were no choppers near by
I latter found out it had a bipod on it before, but had been removed.