My brother in law just handed me an interesting project. It is a carbine in .38 caliber labeled Navy arms. It looks similar to an 1866 Winchester. There are no other markings other that what appears to be proof marks on the barrel. The carbine lever will not close nor will the weapon function. The side plate screws seem to be under tension and I am reluctant to break off a screw attempting to remove them. I am seeking some advise on disassembly and a parts schematic. Do any of you guys have experience with this weapon?