[Rod Bellars (RIP)]

yes on blow up it seems they have mated a 2pdr gun and recoil to a 6pdr saddle and shield with elevator . Interesting here they mated a 20mm on a 2pdr mount with an adapter that replaced the barrel and recoil .
shots attached of tin ready use on my gun under the leather spares box and a stack of assorted ammo tins and storage tins in front of gun all ammo is inert and correct to local law in case anyone gets worried , aussies used red and green tins in pairs in the carry tins , canadian tins are mroe rounded and less complex one is just visible behind the open tin with rounds in cardboard tubes . also there is a selection of rounds ap and ap proof

gun is a first model with mk9/10 barrle that is stepped one in your shot appears not to be stepped so same as one in tanks

behind the ready use tin is two more tins of rounds and just visible to lower left of gun is visible a canadian tin and to left a two round storage tin just edging in shot
regards
rod