Today we're looking at an Evans repeating rifle. These were manufactured in Maine between 1873 and 1879, in three distinct models (I did goof in the video and called this particular one a transitional model, when it's actually a new model). The way to distinguish the variants is:

Old Model: No wooden lower buttstock
Transitional Model: Two-piece wooden buttstock, but no dust cover on the ejection port
New Model: Two-piece wooden buttstock and ejection port cover that moves with the operating lever.