It's an exact quote from the two Supreme Court decisions cited.
"The Second Amendment declares that it shall not be infringed, but this, as has been seen, means no more than that it shall not be infringed by Congress." - US Supreme Court, U.S. v. Cruikshank, 92 U.S. 542 (1875), Presser v. State of Illinois, 116 U.S. 252 (1886).
Pesky facts.