homemade firearms. So far as I know he never actually built one , just wrote about it. (I stand corrected: He built and test fired the gun for the original book which Paladin publish.
He got five years in a high security prison for that one, stuck in with the murderers and hardened violent crimminals, I don't think they even let him attend his mother's funeral) For which the British government and bastard excuses for lawmen harassed him- actually jailed him a couple of times- for daring to do.
I just got word he died. His website is being kept in service here in the US, well worth browsing through.