We have the same problem at work. No money to change to better locks. We use a side mount like the one above. I have a barrel mount from Zahal on my Mini 14 which I would use on an AR if the chief let me bring one to work. I may have gotten one of the last ones out there because it's not there.
This might work if you want to mount the light on top of the barrel like LAV. http://www.amazon.com/gp/product/B00...6Q4NPRHQC7N05D


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