I picked up a Stoeger Silverado in 20 gauge from a buddy. It is brand new and breaks open really stiff. I was going to smooth up the action, but thought I would just replace the firing pins and lever spring with upgrades from Ling Hunter. Does anyone know if these parts are interchangeable between 12 gauge and 20 gauge guns? I am assuming so, but I would hate to order the parts to find out they are no good to me.