Not neccesarily for spotting, it may be a matter of economy and convenience.
There were similar setups on various artillery pieces for smaller range training. There is an attachment to put a Bren on the 25 pounders, so you only needed a regular range to do your drills rather than a 20 mile plot of land.
I think there was also a system to attach a Ross to the Boyes rifle for cheaper range training as well.
Whatever yours attached to, it was solid, hence the recoil system built into the mount.
Now that you have the rifle, you must buy the next higher assembly. After all, go big or go home.
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