- [Daily Mail, Where America Gets Its News] Kevin Norton, 19, and James Stumbo, 28, each pleaded guilty to charges
- Were both ordered to receive mental health evaluations during their term
- Pair brought the high-powered weapons to the event in Boston last year
- Beforehand, they had posted pictures of the firearms on social media
- Alongside the image, they said: 'Boston, here we come'
- Norton, meanwhile, had joked in a comment about 'killing the competition'
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