My son has a Pardner Pump 20g with a Mod Choke. He wants to use it for turkeys in a couple of weeks. I am having difficulty finding a turkey/xfull tube for this shotgun. I know it is a Remington 870 clone but the barrels are the one thing that is not interchangable with Rem shotguns. Do they use RemChokes or their own proprietary tubes? Will the Pardner single shot tubes work in the Pump? Any help appreciated.