yep you got a tinkered with Python.
Or a tinkered with Trooper, or "Pooper" as a Trooper with a Python barrel is sometimes called.
No, it appears to be a Python, the pins are in the right place on the right side of the frame. And that doesn't look like a Trooper's hammer. The trooper's hammer was wider with very sharp checkering, and they were pseudo-case hardened.
That hammer is not something I've ever seen; weird.