I'm refurbishing my brother's Marksman 45 .177 cal rifle. The trigger blade is plastic and shows a lot of wear, to the point that I cannot adjust the trigger any at all and keep the safety working. I found a partial trigger assembly on ebay from a Beeman Sportsman RS2 that looks to have a metal trigger blade and looks identical to this Marksman 45 trigger assembly. My question is does anyone know if they are interchangeable?