Brady files FEC complaint against NRA, GOA
News release here, but no details. A general guess: under the various finance campaign laws, a nonprofit can advocate the election or unelection of a candidate, but only in messages to its members, not in any aimed at the general public.
UPDATE: Second Amendment Fdn. has filed a complaint against Brady, on the same grounds, pointing out that their press releases, circulated on the internet and by wire service, also reach their nonmembers.