Firearm Safety Devices Corporation Gun Lock CA MA & MD Approved. When applied correctly" FSDC products help prevent accidents and allow you to keep your firearm locked" stored" or transported safely. Specifications for Firearms Safety Devices on Gun Lock CA MA & MD Approved: Manufacturer: Firearms Safety Devices Additional Features: Gun Lock California Massachusetts Maryland Approved Features of Firearms Safety Devices on Gun Lock CA MA & MD Approved: Fits Most Handguns Rifles & Shotguns Package Contents: Firearms Safety Devices on Gun Lock CA MA & MD Approved