Cuir crìoch air an abairt a leanas: Choisinn McMahon bonn-airm aig Geamannan FESPIC 2002 anns an 4 × 400 m relay, Men's Javelin F37 aig 2006 IPC Athletics World Championships agus Men's 4 × 100 m T35-38 aig an
2011 IPC Athletics World Championships. Ann an 2006, fhuair McMahon Duais Coileanadh Spòrs 2006. Aig na Paralympics 2008 ann am Beijing, chrìochnaich e an ceathramh àite ann an Javelin F37/38 nam Fear.