The clip and extra sling was the clever bit. Unclipped it was still in your hands and totally usable, but always tied to you. Clipped and worn on the back or front hands were free to operate the mortar or whatever. I never understood units that didn’t issue the whole thing as it was designed.The advantages were the overall size and weight of the SA80 vs that rifle.
Someone else will have done both in NI.
The thing about the SA80 was it had a clip to hold it across your chest and leave both hands free to do other tasks.
The High Ups said no, and therefore on tour hands would be on the rifle (as it was then being called) at all times.
LSW was also inadequately introduced (my burden), and that brought further issues.