The Bureau of Alcohol Tobacco Firearms and Explosives is offering up to $5,000 for that information.
Investigators say 27 shotguns, rifles and handguns were taken from the gun range earlier this month. Only 11 of the guns have been recovered.
Three teenagers are charged with stealing the weapons. Three other teenagers are being sought.
Anyone with information should call the ATF's hotline at 800- ATF- GUNS.