As I understand now, officers could purchase these rifles with any number of options, including target grade 24" long Barrels, all sorts of checkering and any of the various various sights.
I missed one a little while ago with a full rib fitted along the top, fully chequered and engraved, including the buttplate.
Nobody knew what they were dealing with including the owner of the store, as he was only asking $250 for it and couldn't move it. Shame there isn't more information about these, as they are little jewels.