Here's my guess on the action: Double Purdey underbite, standard Anson & Deeley, 3rd bite I cannot make out from this angle (vitually all double rifles have a third bite), side clips, clam shell ....now it gets a bit iffy as the undermetal has a bit of the Westley Richards influence. Some of them had neat replaceable triggers which would drop out. Good idea on a double in case one broke. Neat gun but looks heavy. 12-13 pounds???