Racial Edge Sharpens Debate On South Africa's Gun Laws
South Africa, rife with crime, is in midst of fierce debate over gun laws, which are very strict on paper but are only haphazardly enforced; Afrikaners have frontier tradition of gun ownership and blacks were long forbidden to own guns; infusion of weapons during antiapartheid struggle fostered political killings and huge crime wave in black townships; about 10,500 South Africans were shot to death last year; gun control movement, foundered by whites, is rejected as 'racist' by many blacks (M)