1) Where, in the Constitution, is the Congress authorized to require a background check prior to purchasing a firearm?
2) Where, in the Constitution, is the Congress authorized to keep records of who has purchased what firearms and when the purchases occurred?
3) Leftists keeping records of firearm purchases inevitable leads to leftists attempting to steal those firearms.
4) What part of "shall not be infringed" is difficult to understand?
Apparently, it's the part about "shall not be infringed" that leftists have trouble understanding. Purposely, I might add.