Is this a Long Branch forestock?

[Surpmil]

I have a S51 no4 T converted to 7.62x51 with a DCRA conversion number
Scope, scope metal box, in a sniper box
I thought that Long Branch did this work for the DCRA.
Wonder what the history of this conversion is

Someone who thought like Mr. Whittaker of the infamous Whittaker Conversion: when building a target rifle start with a rifle already selected for accuracy (in the hope that most of the accuracy is in the action rather than the barrel & bedding)

Somewhere in the bowels of the DCRA there might be a record of which conversions were done for who, but I suspect it was more informal than that.

Whatever records SAL/Long Branch kept were presumably junked when Turdeau I closed it all down.