re the range problem,
I've seen it happen, with a Rock range instructor using one hand to grasp near the muzzle (for maximum leverage), and the other hand, with the five digits grouped in a tight bunch, used to persuade the miscreant to immediately release the weapon.
100% effective and the safest way to solve the problem, which is the point.
The art of range instructing is not letting it get to this point, but in this case the Instructor had to take people he did not know.
500N, 49 para details here, courtesy of the Pongoes, but you didn't hear it from me, right
49 Para - ARRSEpedia
24 SAS details at same source