The Fifth Model version of the Burnside carbine with its signature guide screw on the frame is the model purchased in quantity for use by the Union cavalry units starting in 1863. It was very popular with the troops for its accuracy and reliability. The top of the chamber marked "BURNSIDE PATENT/ MODEL OF 1864". The lock plate is marked "BURNSIDE RIFLE CO/PROVIDENCE R.I." Small single letter inspection marks are on most of the components. The matching serial number is on the breechblock and frame. The barrel is marked "CAST STEEL 1864". It has pinched blade front and two leaf folding rear sights graduated for 100, 300, and 500 yards. It is mounted with a smooth straight wrist stock and forearm marked with "J.M.W." on the underside of the forearm, "HDH" and "RKW" cartouches on the left side of the wrist, and "R.K.W." just ahead of the buttplate tang. It has a casehardened barrel band, bright saddle ring and bar on the left side of the action, bright swivel on the bottom of the butt, and a casehardened buttplate. The barrel is blued. The action, trigger, and breech lever are also casehardened. The breech and tangs are niter blue.