I own a dozen handguns and have tried all kinds of locks. When installed properly, Master trigger locks, whether key or combination, will with almost complete reliability do what they are supposed to do: prevent a child, visitor, family member, or intruder from picking up the gun and firing it, accidentally or on purpose. But BE CAREFUL, because people have managed to fire guns equipped with trigger locks. On some guns, the configuration of the trigger guard does not catch the little posts on the lock, and it's possible to slide the lock and engage the trigger. The lock itself can fire the gun. The National Rifle Association discourages use of trigger locks, and there are better routes to gun safety.
Why do you want to lock your guns? To prevent them from being stolen? To make it extremely difficult for someone who steals one to get it operating? To make it impossible for someone to pick it up and figure out how to fire it?
If you want to prevent theft, then get a real gun safe. If it's a large safe, nobody will drill or pry their way in, and it will be far too heavy to carry. If it's a small safe, bolt it to your basement floor with masonry bolts into lead anchors. They won't excavate your floor to steal a safe unless it contains a whole lot more than guns.
If you want to lock your gun so that it's practically useless to a thief, then get a serious padlock, probably with a long shackle, and lock it onto the frame so that either lock or gun practically has to be destroyed to get it off. For a revolver, open the cylinder and lock the frame. The cylinder cannot be closed, and the gun cannot fire. For a self-loader, remove the magazine, EJECT THE CARTRIDGE FROM THE CHAMBER, open and latch the slide, and lock the padlock up through the handle and out the top. (You might need a pretty long shackle on some guns.) You can also use a cable 3/8" or even 1/2" thick and a good padlock. Get a 5-foot cable and lock several guns at once. Some of the better bicycle locks work great. I use a 5-foot Schlage lock and cable in my car, and secure my 9-mm Beretta to the foundation of the passenger seat if I'm not going to carry the weapon. I also cover the gun with something so it's not visible to the paroled murderers walking by. Not easy to get that gun, even if you steal the car.
Yes, someone willing to dynamite your basement floor, haul away a 300-pound safe, spend hours opening up your safe with torches, and spend hours more filing away hardened steel shackles (or trying 3-digit combinations) will be able to steal your guns and use them in crimes. But they won't. There are far easier ways to procure firearms.
Note: If you do use a Master trigger lock, insert it so that the connecting bar is behind the trigger, if possible. If you do this, the trigger can't be pulled, and the lock can't be slid around so as to engage the trigger. In fact, a large enough padlock can be used as a trigger lock as long as the shackle can't be maneuvered around the trigger or to a position in which the trigger has clearance to fire.
Oh, and . . . I will give up my gun when they pry it from my cold dead fingers.
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