Why would anyone put a "trigger " lock on a Mler???? Just put the gun on a couple of pegs, so the barrel is horizontal, over a mantel, if you have a fireplace, and hand the horn and bag someplace where they won't get too much heat. Actually, putting any gun over a fireplace that is used much is not good for the gunstock- it dries it out. So, find a wall where you want to display the gun(s) and put up a rack there. Find a cool, dry place and you won't be sorry. The folks who are bothered by P/C are not likely to be looking at your guns, anyway. In fact, if they come into your home, and see any guns, the are likely to go screaming into the night!( good riddance!)
BTW, there are only a few "trigger locks" that dont have some kind of cross bolt that passes through the trigger guard in front of the trigger. If your Lock is one of those that do have such a cross bolt, you can fire the gun by just yanking back on the lock itself. To have any accuracy, of course, you would have to brace the barrel against something solid, and the target would have to be big and close, but inside a house, that would be expected. I Used a " MasterLock" trigger lock to demonstrate this to the Urbana, Il. city council to help defeat a Mandatory Trigger lock ordinance they were considering passing. I took the trigger assembly from my Remington Shotgun with the lock in place, ( because it was the only gun I had where I could separate the trigger assembly from the gun- they would have had a hissy fit if I attempted to bring a real gun into the council chambers!)Cocked the hammer, and them yanked on the trigger lock. When that loud click was heard, and they saw that hammer drop, all the wind came out of the sails of the bill's sponsors. I was shown later a memo from the City Attorney to the councilmembers where he indicated that "Mr. V's demonstration indicates that trigger locks are not the safety devices we were led to believe, and it seems pointless to require citizens to use them."He recommended that they let the matter die.
They did. ( "The Truth will set you Free"!)
I had a gunrack in my bedroom when I was younger for years, with whatever long guns I owned then. It reminded me to dust them at least once a week, and then oil them to keep them in good condition until we could get back out to the range to shoot.
We did use a lock and cable to attach all the guns together to discourage theft, in event someone broke into the house. Security is a concern, because any gun rack is going to give notice to every person, adult and minor that visits your home for any reason, that you not only have guns, but where some( most?) of them are located. If you can mount a large bolt to the frame of the house, and secure a cable or rod that locks the guns to the rack to that bolt, It really impedes thieves, who want to get in and get out as quickly as possible with as much as possible. They may bring wire cutters big enough to cut a bicycle cable, for instance, but it may not be big enough to cut tht large bolt, or a hardened steel rod. I also make a habit of removing key parts from the guns I display- such as the bolt from a bolt action rifle. I know of no crooks who are interested in stealing any muzzle loaders. There is just not much of a market for stolen smokepoles, because other crooks can't use them.
Its the same reason that burglars walk right past valuable paintings, and other artwork. My ex-wife had about $200,000 worth of antique, sewing "Samplers" mounted in frames under glass on the wall where her stairs to the loft above were located. I can't imagine you could find one thief in 100,000 who would look at those twice, much less know their value, or where to market them to get even 1/100th of their value.
Remove the nipple from any percussion gun, and its worthless to any fence. He's not going to pay the guy anything for your gun. Remove the flint from a flinter, and the same result. Do you think a fence is going to have extra flints and flint wraps on hand to put that gun back into firing condition?