As I understand it you need the foresight removed first by ‘Qualified Armourer’ even though it is part of the training to use and clean the weapon. If your DPs are like mine, then the foresight screws have been locked into place by the same bods who put the wheels onto cars at Silverstone and are pretty much impossible to remove.
I do remember an instruction somewhere (not part of the shooting policies) from when Arms Drill first started saying only the L98A2 was to be used for arms, I think to stop sqn using the old .303 or the No 8.
One thing I’ve been told is that apparently under the firearms act, the L98A2 can only be used by Cadets & SNCOs for target shooting on military ranges unless supervised by service personnel so you would need to have an officer supervise the SNCO teaching the arms drill - not sure if its true but apparently its linked in with the issues regarding SNCOs & CI transporting arms and ammo.