help identifying this artillery piece

[italwars]

hello
i already have one and i'm thinking of buying a second to complete my battery ..it's a Minifig 25mm gun..but which type?..i'm referring to the one on the left..the field piece..the other,  i know, is a mountain gun
thanks
http://www.ebay.co.uk/itm/Sudan-War-25mm-Historical-Mini-Figs-Lot-14-/231473403663?

[Lowtardog]

Hard to tell from photo but looks little like a 9pdr