Stan Hollenbaugh, who is on this forum, makes a very nice lock for pistols. It is his "Ditchburn" J. P. Beck lock, and is 4.125" long by 0.75" high. Great sparker, good looker.
When I sit the pistol lock beside any rifle or smoothbore lock, I am surprised at the small size of Stan's lock. Quite petite!
If you are interested, please PM me and I will share Stan's address. He does have a website, but I'll be darned if I can recall it. One of those I didn't copy when I got this new computer a few months back.