Doesn't matter... making guns more difficult to get will affect illegal sales as well. Don't let the perfect be the enemy of the good. It will save some lives, even if it's not a perfect solution.
Well if he didn't have a PAL or FAC he couldn't have got them from a legal source so what is the point of more regulations?
How many could they have hit with a semi-auto modern rifle with a 15 round clip and spares on their belt? The average shooter can't do that.
A lot but these guys were exceptional. At the beginning of WW1 the pre war British regulars were so well trained and their rate of fire was so high, the Germans thought they were up against machine guns at Mons.
The Lee Enfield was also one of the most successful infantry weapons in history, it was the standard British (and Canadian) infantry rifle from the late 1800's to the 1950's.