A Florida college student allegedly ordered 1,500 rounds of ammunition to his dorm room, where cops later found a semi-automatic rifle stashed under his bed, according to police and reports.

Constantine Demetriades, 21, was busted Wednesday after security at Rollins College in Winter Park flagged his massive online ammo order, according to charging documents obtained by WKMG.

Police later arrived and found an AR-15 and six magazines — one loaded and five empty — along with a tactical vest, multiple knives, a black security vest, ear protection, and a pistols storage case, Winter Park authorities said.

Although Florida allows open carry, the liberal arts college, where Demetriades is a senior, bans all weapons on campus, the school’s website states.

The suspect allegedly admitted to

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