A guard accused of stealing "flash-bang" grenades from Colorado's Supermax prison has pleaded guilty to a federal weapons charge. Christopher Turner of Canon City entered his guilty plea Tuesday in federal court in Denver. Turner served on the prison's Special Operations Response Team. The Denver Post reported that Turner admitted taking 10 grenades from Supermax, which houses the country's most notorious criminals. Turner said he sold one and ignited others for the Fourth of July. He first tried to get the case against him thrown out. He argued that it was common for members of the prison's elite operations team to take the grenades home with them and accused the government of selective prosecution. Federal prosecutor Mark Barrett said that munitions controls at the Supermax armory were "very lax" and agreed that other officers may have taken stun grenades.