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So really, the story is this. The ROF wanted to and did claim credit. The claim wasn't an outright lie so much as gleeful ignorance. They admit to violating federal weapons laws, and willfully chose to align itself with the shooter, who independently was a white supremacist.
There's a bolt action in this pic from his Instagram http://www.miaminewtimes.com/news/nikolas-cruz-legally-purchased-ar-15-despite-long-history-of-mental-illness-warnings-10089980 …pic.twitter.com/qZZduEs847
Yeah but that's not a mosin nagant
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