They do NOT have enough people to accomplish that effort, local police in red counties would Not do it, ppl know who they are and where they live.
City police have the same issue and you roll up to confiscate guns you better bring body bags because some are not going to make it home.
And then what, NG... They are not stupid, they know their families are also in the line of fire...
Military ?? They are MOSTLY Patriots, those that are not are buddies but not going to let them kill Patriot Americans just for a political party revenge.
These are very real probabilities.
It will be the slow boil. They will try and tax your weapons at first. That is a clever way of getting them to make a list.