MetroWest Daily News: Across the water, U.S. gun culture a mystery

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As a military specialist explained on Irish radio in the aftermath of the Orlando shooting, the semi-automatic AR-15 assault rifle is a merciless weapon in a combat setting, capable of penetrating walls and hitting targets hundreds of yards away. Plainly, then, not a weapon that belongs on America's streets, as Mass. Congressman Seth Moulton, a former active-duty Marine in Iraq, has pointed out.

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