I have a Thompson Center Thunderhawk that I love. It was found in a basement shot, left and crusted and rusted. I was able to break everything free and get it cleaned up. Shoots spectacular with TC shockwaves and 100gr of powder. I have had a few instances of primer misfires and see that at one time a 209 primer kit was made for it, discontinued now. Any downside to doing the switch over? Any idea where I may be able to track one down?