I know this is an old post but I have a .25 ACP Davis derringer that my dad bought new in the '80s. I also have his hand-me-down Rohm RG24 and Arminius 38. Can anyone guess the old man was cheap?! I have put about a hundred rounds through the derringer and it has never let me down. I will never get rid of these "junk" guns because they are still here and Dad isn't. As mentioned above, the screw(s) need tightening every once in awhile but it keeps on going. And mine fits nicely in the watch pocket of a pair of Levi's