I am not quite sure of the repro 1863 muskets; but the real M1863 musket had two different types of barrel bands. The type 1 barrel bands were similar to that of the Enfield and each band used a tightening screw to hold it in place. The type 2 barrel bands did not utilize a screw and saw the return of using a retaining spring to keep the barrel band in place; similar to earlier patterns of US and French muskets.