User blog:QRAeona/Eustass Kid's gun

I've been trying to do research on what type of gun Eustass Kid uses before the timeskip. I think it's the Deringer Model 1842 Navy Percussion Cap, Rifled Barrel Pistol but I'm not too sure.

Here is the gun I suspect is similar to Kid's --->

I find it incredibly similar in shape and just how it looks.

I've been comparing images for a while now and this is the one I keep coming back to.

Can someone define what type of gun it is that Kid uses? I'm writing a fanfic and I'm trying to be as accurate as I can considering I'm writing a part where he's cleaning the gun.

Is it a flintlock gun? Or a percussion cap like this picture here?