The NSSF has had a political action committee for years. But traditional PACs have restrictions in what they can do. Contributions from supporters and outlays to candidates are limited.
While a so-called Super PAC can take in contributions of unlimited size from all kinds of contributors, it can’t contribute directly to candidates. It can only make independent (not coordinated with any particular campaign or party) expenditures.
It can, however, spend all the money it wants on, say, issue ads, touting the importance of voting for candidates that support gun rights or educating the voting public on why a particular candidate’s past support for gun control laws threatens your rights.