the informant said one friend, matt moeller, agreed to help by providing the gun in return for money. was an average kid who got dazzled by the money, dazzled by the possibilities. when a rich kid tells you, you can be part of my life, you can have a big fancy house, a fancy car, your life is going to be different if you'll help me with this, he got caught up in it. >> police found a .22 caliber rifle in matt's bedroom, which they confiscated and sent to ballistics. there, kurt moline test fired moeller's rifle into a 600-gallon water tank. >> and i shoot in one end and the bullets hit the water and they slow down and they drop to the bottom, and then i vacuum those up with a hose. >> he took the test-fired bullet and compared it to slugs recovered from ken maclennan's body. >> the lands and grooves did not match up. a closer examination showed why. a borescope, a fiberoptic mag fireagnifier, revealed a series of abnormal scratches on the inside of the gun barrel. >> the scratches appeared to be fresh. they had scratched through the blueing, which would have been applied at the factor