I can't remember seeing any Mk4's anywhere except either on AUCTION ARMS or GUNSAMERICA or GUN BROKER if you looking for an orginal collector's piece. SOG(southern ohio gun) has Enfield's in No1 Mk3 w/wire wrap & No.1 Mk1 jungle carbines which are C&R's and Gibbs in both 303 quest sporting rifle (new jungle version) and the Summit Frontier sporter in .45/70 which are made from the No1 Mk3's. I just seen a No1 Mk3 w/wire wrap in 303 for $49 at Century Arms and they also have a .410 musket one for the same price too. BigBill
The wire wrap stocks were done to reinforce the stocks for accuracy but also for shooting the gernades.