Hard to believe that there is a gun rights group out there even more extreme than the NRA, but there is: Gun Owners of America.
Ted Cruz has gotten their coveted endorsement for president (and the endorsement is just so much extreme insanity).

Gun Owners of America makes its presidential endorsement https://t.co/oWTE2Ko8ih

— Joe Miller (@JoeWMiller) February 29, 2016

(Joe Miller is a total nutball Libertarian/Ron Paul person who won the GOP nomination for Senator in Alaska, which Lisa Murkowski eventually won as a write-in in the general election.)