RR, The C/broad arrow stamp is an ownership mark. Not all Long Branch rifles were issued to the Canadianicon military. Two of mine don't have the stamp and it's nothing to worry about unless it's a feature you desire.

WRT the SMLE, yes the numbers would match all around if work were performed during a FTR. Older SMLEs can have at least three different fore end styles depending on when the rearsenal happened. Many rifles built/rebuilt during the inter war era had fore ends clearanced for the cut off, but no mill work for volly sights. This is because although inter war rifles were again Mk.IIIs, they weren't the same as pre/early WWI Mk.IIIs in that the volley sights and windage adjustable back sights weren't reinstituted.

While it's possible to be a civilian rebuild, it can also be an expediant field repair...who knows for sure.

Brad