Originally Posted by dyna mo

took me ~45 seconds::::


Law enforcement sources told ABC News the gun recovered from the scene of the Tsarnaev brothers' shoot out with police was a Ruger 9 mm semi-automatic handgun. Sources said the gun is in the custody of the Massachusetts State Police lab and that the serial number on the firearm was obliterated.

Investigators have techniques to raise serial numbers after they have been obliterated so they can be read. Investigators would use the serial numbers to conduct urgent traces on the gun to determine where and how it was purchased.
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The Tsarnaev brothers' apparent lack of firearms has led some investigators to theorize that the attack on MIT police officer Sean Collier, in which they allegedly ambushed the officer and shot him five times in the head, was an attempt to arm themselves, officials said.