Springfield police say someone used a sledgehammer to smash in a glass door and gain entry to the Farm and Home Supply store on North Dirksen Parkway early Monday.
Once inside, authorities say the suspect broke into a gun display case and stole at least two handguns.
Several other guns were left behind.
Surveillance video shows the burglar was wearing gloves and a mask, but appeared to be between five-foot-four and five-foot-seven.
Also on the crime beat: Springfield police are looking for a biter.
The State Journal-Register reports two men were arguing over money Monday morning outside their homes on Amos Valley Drive.
One man bit the other and grabbed $89 from the victim, then fled in a vehicle. Police have not yet tracked down their suspect.