Niether was I. Google for: fallout bullhorn trap and look for a note by Robert Luong:
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Anyways, after the 1st mission, go back to alpha bunker, buy the bullhorn, equip on free slot. Automatic 12 Str., 70million HP, and your small arms goes into 70million% too. it was crazy=) No one ever misses. Every shot is a critical. Now, only thing you gotta be careful of is when u're addicted you have a random chance of dying. But I went for months with out dying, then all of a sudden after I complete a mission I die. I just unequip the bullhorn for a sec everynow and then just to be safe. Sucks, but only if you didn't save. I guess that's the only drawback.
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PJ