Back in 2008 I posted here of a 99 243 that I picked up. S/N 967,8XX that lettered being shipped late December 1959. This post brought me back to that discussion as this rifle has a Westfield barrel on it. I finally got home, pulled the scope and the front screw and lo and behold, square threads. At least that answered the question from before. But, looking at Murrays, the barrel address is style shown for the new 99A. Keep in mind that nowhere on the barrel does it indicate that this an F but it has the F forearm, the barrel boss for the rear sight and 22" barrel. An F in every respect other than the Westfield barrel marking. I gotta believe that it must have been a factory rebarrel job. Now to put the mongrel back to bed!