First of all, the biggest "Gun" any cadet would ever fire, as a cadet, would be the C12, or C12A1. The CF's Match 7.62 Target Rifle. Runner up would be the C11 or C11A1, the Match 5.56mm Target Rifle. And you only get to fire those, if you went to Cadet Leader Marksman, or Cadet Leader Instructor Marksman, OR, if you were good enough to get on the Bisley Team. Below that would have to be the C7. NOT the C7A1, because you guys aren't allowed to fire them, and you only got to shoot that if you were on your CORPS' shooting team, and went to the ORA's Cadet Service Rifle Shoot up at Connaught.. There was a bit of a bumblef*ck when I first joined cadets...back in the DAY, and I got to fire the C8, not the C8A1 on my First Field Ex. The Ontario Regiment got a real reaming out for that.
an M14 is not a Sniper Rifle. Its a Service Rifle. An M21 is an accurized version of the M14, with a chrome-lined barrel, match, refined parts, and a scope.