Back door gun control is the phenomena where an entity will enact a law that indirectly affects your right to keep and bear arms. It’s easier to pass legislation that harms Second Amendment rights when it does not directly require the citizen to surrender a gun.
Examples of back door gun control are:
Define ammo components as an unhealthy threat. Environmental laws designed to outlaw the use of ingredients that comprise components of arms related materials. The easiest example to point to is lead. Lead has long been the primary ingredient of bullets. Designating lead as an environmental hazard means that its use can be tightly controlled, and therefore restricted. Restrict lead and you restrict bullet production. Restrict bullet production and you dilute the ability to purchase ammo through increased materials cost.