He competed at the 2012 Summer Olympics in the men 's 10 metre air rifle and men 's 50 metre rifle prone .
Mangala Samarakoon is a Sri Lankan sport shooter .
Mangala Samarakoon competed at the 2012 Summer Olympics in the men 's 10 metre air rifle and men 's 50 metre rifle prone .
Mangala Samarakoon is a Sri Lankan sport shooter .