Martin Barden of Fordingbridge-based UK Cycling Events, which has organised the New Forest Sportive over the past five years, said it had benefited from the legacy of British cycling success at the 2012 Olympics and Tour de France.
"It doesn't prevent someone from going out of the state to purchase them and then bring them back, " said Mark Barden, whose seven-year-old son Daniel was killed in the shooting.
Allowing such large-capacity magazines to remain in the hands of gun owners would leave a gaping loophole in the law, said Mark Barden, whose 7-year-old son, Daniel, was killed in the shooting.