I have no idea what hoofing means, but it is apparently what the British Army’s new AR-10 style L129A1 is, as described by Commando Sergeant Baz Evans in a UK Ministry of Defense Press Release (via. Kit Up blog ) …
“I have fired over 1,000 rounds on the rifle in training; accurately hitting targets over 800 metres away. The new Sharpshooter rifle provides quick and accurate fire, with the flexibility of using it in the assault rifle role as well. It’s hoofing.”
Lewis Machine and Tool who manufacture the rifle had it prominently displayed at SHOT Show.