Well got the old models out yesterday, and shot it to my new 617...WOW..They don't make em like they used too!! Have one from 1957 (3 screw) and a 1978,1979 models.....Shoot like a dream compared to the new fulllug stainless model I got for Christmas from the wife...Guess it is gonna be the new Coonkiller this season...and its stainless so I aint gotta worry about it as much!