Republican state Sen. Ben Kieckhefer of Reno says Nevada has a system designed to keep guns from those diagnosed as dangerously mentally ill but that it isn’t being properly enforced.Kieckhefer said the situation is particularly difficult in Northern Nevada, where there were 601 petitions from psychiatric professionals to involuntarily commit potentially dangerous individuals in 2011 but only seven court-ordered commitments. In 2012, he said there were zero court-ordered commitments out of 583 petitions.There is a three-day waiting period while a background check is performed on a prospective gun buyer. Under existing law, only when a court orders involuntary commitment does …