Grumpy Old Geeks Topics Gun registration and training Topic Gun registration and training 2 mentions in 1 episode The hosts discuss a listener-shared article about owning an AR-15 and requirements for gun owners. Mentions 164: NerdWatch 2016! Jun 17, 2016 50:38 All I’m asking for is registration and training if you want a gun. 51:10 Registration training. Well, yeah, more background checks.