Shoot44 thanks - they were the first I reached out to. I used their exploded diagram to find part number. They didn’t offer up that suggestion - just replied they didn’t cary that part.
Find a good Tig welder - cost me $20 (he had it for 4 days and sort of got to it when he got to it). I purchased a few M3 screws which I stripped one removing - reassembled this evening with a new barrel o-ring. So far about 40 -50 slugs shot through re-tuned to 905 fps and I suspect as strong as new if not stronger. I now cary a nylon cleaning rod in my jeep in case of any sort of jam. Good luck