Gun lockers or safes are specifically designed for the secure storage of guns and ammunition. They broadly resemble normal single-tier lockers, but tend to be slightly less high than normal single-tier lockers, and are often free-standing, and not banked together. They are fitted with internal racks designed for holding firearms. They have a shelf at the top like normal single-tier lockers, although in this case it is closed and locked by a separate door, because of legal requirements in some countries that firearms and ammunition be stored and locked separately. They always lock with three-point locking, which is in some countries a legal requirement for the storage of firearms. Sometimes they are made of the standard kind of sheet steel used in manufacturing normal lockers, and sometimes they are made of extremely thick heavy-duty steel and in this case resemble a safe more than a normal locker. In Australia there are strict regulations governing the storage of firearms following the Port Arthur massacre in Tasmania, Australia on 28 April 1996, and cabinets used for storing firearms must be bolted to the floor or a wall if the cabinet is under a certain weight. Dedicated gun lockers are likely to include holes in the cabinet to accommodate such bolting. Several locker manufacturers also offer dedicated gun lockers.
I agree with the suggestion about shipping your skis and boots, especially if you are not going to be using them after the Vail portion of your trip. Are you staying in LA for awhile or just making a connection there? If you are staying at a hotel in LA perhaps you could talk to them about having your equipment shipped there and stored as most hotels do have some sort of luggage storage facility. Hikers on the Appalachian Trail often ship supplies to US post offices that are in towns easily accessible to the trail so they don't have to carry everything with them. A lot will depend on your actual itinerary and whether you are stopping over in LA or just making a connection. You'll likely need to do some research and maybe think outside the box. I know it's always much nicer to ski on equipment you are used to but renting might end up being your best bet and the least hassle.
They are usually intended for use in public places, and intended for the short- or long-term private use of individuals for storing clothing or other personal items. Users may rent a locker for a single use or for a period of time for repeated use. Some lockers are offered as a free service to people partaking of certain activities that require the safekeeping of personal items.
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Lockers are usually physically joined together side by side in banks, and are commonly made from steel, although wood, laminate, and plastic are other materials sometimes found. Steel lockers which are banked together share side walls, and are constructed by starting with a complete locker; further lockers may then be adding by constructing the floor, roof, rear wall, door, and just one extra side wall, the existing side wall of the previous locker serving as the other side wall of the new one. The walls, floors, and roof of lockers may be either riveted together (the more traditional method) or, more recently, welded together.