It's not that simple. You can buy fully automatic weapons, but their limited supply makes them prohibitive for most to own. Ammunition is highly regulated so training with them is also prohibitive. There are many weasely ways to ban things without hard limits. Leftists will turn around and say these restrictions aren't anti constitutional because it's not a hard ban, but call vote id illegal because, despite not being a hard ban, it does present a barrier.
It's not that simple. You can buy fully automatic weapons, but their limited supply makes them prohibitive for most to own. Ammunition is highly regulated so training with them is also prohibitive. There are many weasely ways to ban things without hard limits.