That doesn't make any sense though. The legislature, in a republic, represents the population. So it's the population legislating vicariously. If the population does not have the right to carry firearms, then how can it delegate that right to it's civil servants?
Think of it like a Home Owner's Association in a gated community. Say the HOA votes to hire a security guard to patrol the neighborhood. The HOA may delegate rights and powers to the guard which home owners already have. EG chasing away a robber or taking care of a stray dog. The HOA, representing the home owners, may not vote to have the guard take a painting from your living room and put it in another house, enter your house and eat all your Doritos, etc, because the members of the HOA, as members of the community, do not have the right to begin with.
Saying "let's legislate" does not magically take people and give them the power to delegate rights they do not have. Legislators are just people, like anyone else. If the people do not have a right to begin with then putting on a cap that says "Legislator" does not suddenly grant you the ability to delegate rights you do not have.