obviously more crimes are committed with handguns but here are a few examples of ak crimes
The Stockton schoolyard massacre - On January 17, 1989, Patrick Purdy killed 5 small children and wounded 29 others and a teacher at the Cleveland Elementary School in Stockton, California, using a semiautomatic AK-47 assault rifle imported from China. That weapon had been purchased from a gun dealer in Oregon and was equipped with a 75-round "drum" magazine. Purdy shot 106 rounds in less than 2 minutes.9"School Killer's Last Days" and "The Kinds of Guns School Killer Used", San Francisco Chronicle, January 19, 1989.
The Louisville, Kentucky, workplace massacre - On September 14, 1989, Joseph Wesbecker killed 7 people and wounded 13 others at his former place of work in Louisville, Kentucky, before taking his own life. Mr. Wesbecker was armed with an AK-47 rifle, two MAC-11 assault pistols, and a duffle-bag full of ammunition.10"Rampage in Louisville", Atlanta Constitution, September 15, 1989.
The CIA headquarters shootings - On January 25, 1993, Pakistani national Mir Aimal Kasi killed 2 CIA employees and wounded 3 others outside the entrance to CIA headquarters in Langley, Virginia. Kasi used a Chinese-made semiautomatic AK-47 assault rifle equipped with a 30-round magazine purchased from a Northern Virginia gun store.11"CIA Killings Prompt Scrutiny on 2 Fronts; Fairfax Loophole Expedited Gun Purchase", Washington Post, February 11, 1993.
The Branch-Davidian standoff in Waco, Texas - On February 28, 1993, while attempting to serve federal search and arrest warrants at the Branch-Davidian compound in Waco, Texas, four ATF special agents were killed and 16 others were wounded with an arsenal of assault weapons. According to a federal affidavit, the cult had accumulated at least the following assault weapons: 123 AR-15s, 44 AK-47s, 2 Barrett .50 calibers, 2 Street Sweepers, an unknown number of MAC-10 and MAC-11s, 20 100-round drum magazines, and 260 large-capacity banana clips. The weapons were bought legally from gun dealers and at gun shows.12"Cult's Massive Weapons Purchases Stir Up a Furor Over Federal Regulation", Fort Worth Star-Telegram, May 2, 1993.
Two Border Patrol agents wounded in cross-fire between rival gangs - 04/29/2003 According to reports, one agent was shot in the right arm and the other received gunshot wounds to his upper torso. The victims were allegedly shot at with an AK-47 assault rifle, which penetrated through the back of the vehicle and the car seats before they struck the two victims with great impact. "No exit wounds were found on the victims," Luna said.
http://www.ak-47.us/Crimes_with_the_AK-47.php
there are a lot more, you want me to keep going?
Rifles are not the criminals' weapon of choice, but AK-47s are inexpensive and well made, that makes them popular with all gun users, including criminals