The "unusual lever" may have been used to ram each separate bullet into the gun's cylinder. In that case, it's called the "loading lever."
It may also not be a loading lever at all, but rather a means of ejecting fired cases. In that case, it's an "ejection rod."
Upload your pictures to a separate website called Photobucket. Then, copy each picture's Photobucket "address" into your post on this forum.