What weapons did the the killers use at columbine?

Eric Carried an Intratec TEC-DC9 and a Savage 311-D 12-gauge double-barrel shotgun (barrel sawed down to approximately 23 inches).

Dylan Carried a 10-shot Hi-Point model 995 carbine rifle and a Savage-Springfield 67H 12-gauge pump shotgun (stock and barrel sawed off, reducing the entire gun to 26 inches).

The sawed-off weapons, both around 30 years old, were so short that firing repeatedly from them caused their hands to bleed on the practice range initially. They apparently acclimatized to the weapons over the months preceding the shootings. Both gunmen also carried several knives, but they did not use them on April 20. They named their pipe bombs. Four bombs are mentioned on Eric's website, along with their specs. 'Vengeance' and 'Atlanta' were found at the Klebold residence when police searched it.

For more info and pictures of the weapons follow the link in the "Sources and Related Links" section below.