Wonderful post ....Never thought about the rarity of single barrel fowling guns from the period. In my entire database from that period, there is one Reilly single barrel wild-fowler 11937 (circa April 1861) - I don't want to have to pull that trigger - but this 4 bore might more likely have been in the punt gun category. Have no idea what it was converted from...muzzle loader or pin-fire:

https://www.bonhams.com/auctions/14918/lot/52/
A 4-BORE (4IN) SINGLE-BARRELLED HAMMER WILD-FOWLING GUN E.M. REILLY, NO. 11937
Damascus barrel engraved 'E. M. Reilly & Co. 502 New Oxford St. London Converted by J. Squires 14 New Castle St. London.'
Weight 15lb. 2oz., 14 5/8in. stock, 39˝in. barrel, 4in. chamber, nitro reproof


Baluch are not Brahui, Brahui are Baluch