Holmes bought one of the four guns — the first of two .40-caliber Glock pistols — on May 22 at Gander Mountain in Aurora, according to the official, who spoke on condition of anonymity because the probe into the shootings is ongoing. The other purchases:
-- On May 28, six days after purchasing the Glock, Holmes purchased the Remington 870 Express Tactical 12-gauge used in the shootings from Bass Pro Shops in Denver.
-- On June 7, Holmes bought the Smith & Wesson M&P AR-15 assault rifle rifle used in the attacks at a Gander Mountain store in Thornton, Colo.
-- On July 6, Holmes returned to the Bass Pro Shops store in Denver and bought the other Glock pistol.
Holmes had a high capacity ammunition magazine in the assault rifle, according to a second federal law enforcement official.
The second official, who also spoke on the condition of anonymity to discuss the ongoing investigation, said Holmes had a drum-style magazine in an AR-15 assault rifle used in the attack at a movie theater in Denver suburb Aurora, Colo.
The type of ammunition magazine Holmes used in his assault rifle was banned for new production under the old federal assault weapon ban, said Daniel Vice, senior attorney for the Brady Center to Prevent Gun Violence.
When the ban expired in 2004, gun manufacturers flooded the market with the type of high capacity magazines Holmes used Friday, Vice said.
A 100-round drum magazine was reportedly recovered at the scene.
Authorities have said that Holmes had on an all-black ensemble of protective gear at the time of the shooting. An online seller of tactical police gear told the St. Louis Dispatch (http://bit.ly/Pssg9H ) that it sold more than $300 of equipment, such as an assault vest, magazine pouches and a knife, to Holmes on July 2.
Chad Weinman, the CEO of Missouri-based TacticalGear.com, said Friday that Holmes had purchased two-day shipping for the items. He said the expedited timing for the items showed "some relevance as to what kind of mindset he was in."
Holmes is also believed to have hurled two gas canisters into the theater before opening fire.
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