South Korea has come up with a novel way to boost its defence budget - by selling a vast stockpile of old Korean-war rifles to collectors in the US.

The guns were originally sent to Korea as military aid, and some were also used during the war in Vietnam.

For more than five decades, they have been kept mothballed in warehouses.

Most of those on offer are M1 rifles - a weapon once described by US General George S Patton as "the greatest battle-implement ever devised".