‘Batman’ Shooter James Holmes — The Killer’s Arsenal

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James Holmes used 3 different kinds of guns during his assault on a Colorado movie theater … including a high power assault rifle.

The Aurora PD says Holmes was in possession of an AR-15, a Remington 870 shotgun and a 40 caliber glock handgun when he was arrested this morning.

Cops say they found another 40 caliber glock in the shooter”s car, located right outside the movie theater.

An AR-15 is a semi-automatic weapon … capable of firing off hundreds of rounds per minute.