Help Identifying an 1863 Sharps reproduction carbine

[ms3635v]

I acquired an 1863 Sharps carbine reproduction. There is no maker/manufacture name stamped anywhere on the firearm. A four digit serial number appears in three places - under the forestock, at at the rear of the lockplate and on the tang. I will try to post pictures. Any thoughts on who manufactured this carbine? Any help would be appreciated.

[ms3635v]

593594595596

[Charlie Hahn]

Based on the fore arm mount in the dovetail, and no stepped block for a flat lever spring, this would be a SanMarco, or IAB.

Charlie Hahn

[ms3635v]

Thanks Charlie. The rifling is seven lands and grooves.