Another pistol that is in the size range as the Kahr PM40 and PM9 is the AMT backup. I have an earlier production one. I looked up the specs and its slightly bigger and heavier. Its DOA also. It has no sights, just a groove. Mine is in .45 ACP. I am not sure they made any other calibers. They did/do make a .380 which is smaller.
Another is the Detonics on the used market.
Tom