Stack-On"s GCDG-9216 16-31-Gun Convertible Double-Door Steel Security Cabinet is tested and listed as a California Department of Justice firearms safety device that conforms to the requirements of California Penal Code Section 12088 and the regulations issued thereunder. Stack-On"s superior all steel 3-point locking system provides greater security and includes a locking plate that passes behind the steel cabinet frame at the top and bottom of each unit. In addition, a large steel locking plate is secured behind the steel door frame in the center section of the door panel. The patented molded barrel rests, which are included with all Stack-On gun safes, won"t deteriorate or compress over time. The contour of the barrel rest will accommodate rifles as well as side-by-side shotguns. Stack-On"s patented barrel rest standoffs keep scoped rifles away from the back of the safe and allow for one position storage.