The Arms & Equipment in the Civil War Message Board

Trying to locate info on a Massachusetts musket

This might not be the place to ask this, and if it isn't please delete. I bought a S. Norris & Clement Rifle, it is the short model 1863 Eagle with US below, serial no. is 20 and on the left side of the barrel it has VF and a eagle below that it has LFR, if anyone can point me in the right direction, I would appreciate it.
Thanks Greg