[Brian McIlmoyle]

As with all bylaws... they are enforced by bylaw officers.. when they recieve a complaint.
there could be roving bands of youths armed with a variety of replicas... if no one complained .. no one would care to see the bylaw enforced.
Without the lesser offence of the bylaw infraction availible as an enforcement tool ... the only option is to charge with a criminal offense, which in the case of brandishing a replica in public by a minor.. is unlikley to happen

Bylaws such as this will probably be more effective in reducing the proliferation of replicas within the underage community than the Criminal laws, that simply are not being enforced due to the dire consequences of pressing such charges. (court costs, court appearances by police, ect.)