found the cheap hydro assist link - you would need a different ram length for the 80:
http://board.marlincrawler.com/index.php?PHPSESSID=a6599ac61203d962fc89b502f2fe0792&topic=4699.0
http://board.marlincrawler.com/index.php?PHPSESSID=a6599ac61203d962fc89b502f2fe0792&topic=4699.0