A 19-year-old Florida man faces grand theft charges after trying to steal an assault rifle from a gun store ... by shoving it down his pants!

Surveillance video captured inside Public Pawn and Gun in Davie, Florida, shows Marlon Alvarez sizing up an AK-47 before stuffing it down his pants and tucking it underneath his sweater.

Eventually, Alvarez changes his mind and swaps it out for a different assault rifle. When he starts walking out of the store, the owner notices him limping with the weapon down his pant leg.

The video shows the owner tackle Alvarez and manage to retrieve the nearly $900 rifle.

Alvarez ran away, but was apprehended by police a block away. He was charged with grand theft and is being held on $25,000 bond.

Watch the outrageous surveillance footage above.

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