I just got off the phone with Barrett CS, they said the caliber conversions for the MRAD will release Q1 of 2013. A BORS system for the Zero-Stop NightForce will release next year too.
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I dont know, I shot one at the Hide Cup this year and it was a pretty slick setup, if they could get the price down a bit it may help out
I doubt it yet, but give it some time and I'm sure if the platform becomes more popular with the conversions, someone smith will give it a try. Suspect the like ly conversions would be the 375, 416or even 50 cal. Receiver too big and awkward for 260 or smaller calibers.