Hi, I found this butt plate while metal detecting in south Louisiana yesterday at a known battle site. I don't know a lot about civil war arms but from some research I did this appears to closely resemble the Muster 1844 Kammerbüchse rifle which was used by Federal troops. The dovetailed patch box is very similar to it also. The only drawback I see is the curvature of my plate as the Kammerbüchse is straighter than mine. Any help identifying this piece will be greatly appreciated.