Hmm, I had to go lookup a recent thread "across the street" on this subject that I remembered.In that experiment, an Eotech on a Scout mount went 378 rounds at roughly one round every second or two before the batteries went dead from heat. That tells my "payin' for my own ammo and weapons since I'm a civilian puke now" butt that it's basically a non-issue.Since I'm no longer in the military, I no longer partake in mad minutes or spendex's, and if I'm ever in a situation that I have to fire several hundred rounds thru one of my '14 clones in under twenty minutes, I'm probably gonna be dead before my batteries go dead anyhoo.
That said, I got rid of my Eotech awhile back rather than put it on my new Bush build with an ARMS mount simply because I didn't like how much extra height and bulk the Eotech adds to a '14. I loved the Eotech on my M4gery, but when you stick one on a flattop AR you are adding very little to the profile over a traditional carry handle setup, but on a'14 it's more like adding 1/4 or 1/3 the height of the rifle on it. Just not to my liking on these rifles.
Someday, somewhere, someone will make a properly executed barrell mount for the M14. By that I mean with some sort of insulation or coating incorporated into it so heat becomes even more of a non-issue. Possibly some ventilation holes could be added as well without sacrificing strength, switching from alum. to steel, etc.