I found one, for .223 Pistol blueprint, in Junktown. At power house (right bottom side of town) you can ask a scientist in white lab coat about broken robot. High Science (100+) and Repair (150+) could be useful to do this successful.
you have to get the parts from guy in JT first and give them to the scientist in reactor building. after that spam repair on the 3 reactors, when succeeded spam science on 3 reactors... the pull lever on 3 reactors... profit (1k-3k caps depending on stats and or skills) did not gave bp for me though