RIVERSIDE COUNTY, Calif. (KCAL/KCBS) - A man armed with what looked like an assault rifle was no match for the owner of a Riverside County convenience store, and the frightening face off was all caught on the store's security cameras. 

"It's not his first rodeo," said a woman named Marnie, who works for the store's owner, 80-year-old Craig Cope. "He saw on the surveillance, he saw them coming out of the vehicle with weapons."

The attempted robbery happened at around 2:45 a.m. Sunday. 

When Cope saw the would-be robbers entering the store, he whipped out a shotgun strategically placed behind the counter and shot one suspect in the arm. 

As the robbery suspect retreated, security cameras also captured him running back to a vehicle outside. 

"He shot my arm off, he shot my arm off," he can be heard screaming.