Parabola, here are pictures provided by RIA. Gun was made at 16 New Oxford Street, London. You'll see it's a doll's-head extension. RIA did not answer the question about rifling but I assume it is fully rifled.

It has post 1887 London original proof marks. There are two Anson&Deeley patent use numbers - Deeley Patent Ejector use #2363 and the A&D box lock patent use #11096. This is odd. I assume that A&D box lock patent expired in 1889. But here it is a A&D patent use number on a 1991 gun. We've seen this before with Reilly's...barrels using a proof stamp or patent use number after the stamp had changed or the patent expired. Wonder if the barrels were proofed in 1889 and not used on a gun until 20 months later. Reilly did stock barrels to allow him to make faster deliveries. Hope the photos are what you are looking for.

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]