Somebody left our head designer a nice bottle of Johnnie Walker Double Black for his birthday. This is the result. We fired him for drinking on the job, and then rehired him on one condition: his salary is payed in Johnnie Walker.
Well at the time I didn't really come up with details as it was just an experiment and as the descriptions hints, I was partially brickfaced at the time. Its not a double barrel unfortunately (sorry) but now that you mentioned a double barrelled 'volver would be amazing to design.