Here are some pictures of the gun that I'm wondering about authenticity. For reference, In a couple of the pictures, I've also included pictures of parts from my Remington 1858, which is mostly all original except for the cylinder pin and a couple of the screws.
Frame picture:
Grip picture:
Underside of barrel:
Top of barrel:
Frame with cylinder removed:
A little bit about this next picture: cylinder on left is from gun in question. Cylinder in middle is a cylinder that I purchased for my 1858 sight unseen, but represented as being authentic Remington - however, I think it's a reproduction. The cylinder on the right is from my 1858. The gun on top of the cylinders is the gun in question.
Tops of cylinders: Left is from my 1858; middle is from gun in question; Right is the one that was represented as "authentic" but looks too new to be authentic and I believe is a reproduction.
I have other pictures, but figured I'd start with these.