Plans for hydrogen bombs are also easily found online! They were also available in bookstores previous to that.
Unless you were born before Methuselah, gangs have been building weapons since before you were born and the government has used every variation for propaganda.
See zip gun, Saturday Night Special, “plastic guns”, “cop killer” bullets, body armor; suppressors, “black rifles”, and any noun modified by “automatic,” “machine,” or “assault.”
Want to really have some fun? Look up the Arnarchist’s Cookbook. It makes a great gift for any Prozac-laden misfit. Allows their lives to serve a purpose: exemplifying Darwinism in a social construct.
I read the Anarchist’s cookbook 25 years ago, and all I remember is how to make a grenade out of a shotgun shell (that explodes upon impact) and of course, napalm.