The firearms seized in the FBI raid at Jake Paul's house are now in the hands of the Sheriff ... and we're told the guns aren't the reason the feds stormed the place with a warrant.
Law enforcement sources tell TMZ ... there were multiple guns taken from Jake's crib in Calabasas during Wednesday's FBI raid, and they're now being held by the Los Angeles County Sheriff's Department for safekeeping.
It sure seemed weapons may have been what drove the FBI to get a search warrant and, in a massive show of force, raid Paul's L.