Was a Charles Boswell shot gun serial no.13680 made with one set of barrels or two?

Charles Boswell Shotgun Serial Number 13680

Was delivered on January 30th 1901

To: Mr Phillip Levi Esq

Melbourne

Australia

Best quality A&D Pigeon Gun with side clips and Krupp steel barrels

Weight: 7 1/2lbs

Drop: 1 1/2" - 2"

LOP: 14 1/2"

Cost: 25 guineas

There is no mention of a second set of barrels

Regards

Chris Batha

Charles Boswell Gunmakers London England