AR-15 in .50 Beuwolf

Now bypassing the inevitable arguments against using semi-auto sniper rifles of the AR design, do you think this weapon system would make a good one for law enforcement. Definitely not for long-range, which is why I suggested LE situations. It has proven to be accurate enough, minimal recoil, just about like a .308. It has a very high amount of energy transfer and would probably kill someone just as fast as a .308 would. WIth its low velocity and a good hollow point round, I don't think overpenetration would be a factor. So what do you think? Would it be good or bad for a urban LE sniper system?

Jake