While I usually avoid The Daily Mail (and most British press in general), I haven't seen this story reported anywhere else.
A range of 8,120 feet! Two rounds fired, two tangos down. Apparently they still teach marksmanship fundamentals in the UK.
The truly amazing thing to me is that his weapon, the L115A3, is designed and engineered to be effective at ranges up to 5000 feet. So Cpl. Harrison put both of those shots on target at a range 3000+ feet beyond the stated effective range of his weapon.
Well done, Corporal. Perfect conditions notwithstanding, perhaps a few dozen people in the world could have made that shot.