Can you name the 'few' that would have been denied?
A quick Wiki lookup can tell you in 0.6 seconds.
“In the months prior to the attacks, Harris and Klebold acquired two 9 mm firearms and two 12-gauge shotguns. A rifle and the two shotguns were bought by a friend named Robyn Anderson at the Tanner Gun Show in December 1998.[19] Through a friend named Robert Duran, Harris and Klebold later bought a handgun from an individual named Mark Manes for a sum of $500.
Using instructions acquired upon the Internet, Harris and Klebold constructed a total of 99 improvised explosive devices of various designs and sizes. They sawed the barrels and butts off their shotguns to make them easier to conceal.[4] The perpetrators committed numerous felony violations of state and federal law, including the National Firearms Act and the Gun Control Act of 1968, even before the massacre began.
During the shootings, Harris carried a 12-gauge Savage-Springfield 67H pump-action shotgun, which he discharged 25 times and a Hi-Point 995 Carbine 9 mm carbine with thirteen 10-round magazines, which was fired 96 times.
Klebold carried a 9 mm Intratec TEC-9 semi-automatic handgun manufactured by Navegar, Inc. with one 52-, one 32-, and one 28-round magazine and a 12 gauge Stevens 311D double-barreled sawed-off shotgun. Klebold’s primary weapon was the TEC-9 handgun, which was fired 55 times.”
http://en.wikipedia.org/wiki/Columbine_High_School_massacre
Exercise for the reader: which ones are so-called “assault weapons” according to the law? Extra points: how many firearms were modified to be illegal under existing law and making the possession of which a felony? Also: how many of the 99 improvised explosive devices were legal and how many were a felony to make, possess or use in a crime of violence?