I have one Larue OBR 7.62 magazines. It is compatible with SR-25 pattern rifles (Larue, Knights, Remington, LMT, DPMS, Bushmaster, and others that aren't coming to mind).
It was used at the factory to test fire the gun, I assume, and only once by me. It functioned 100%, of course, and is like-new.
Price is $180 shipped. I prefer PayPal (+3% or Gift), but will accept USPS money order.
I will get delivery confirmation, and provide you with the tracking number.
If the buyer wants insurance, they pay the actual cost.
Email if you want a picture. It is what you would expect from a like-new, still in plastic sleeve magazine.