The Fox is well regulated and there is very little discernable difference in POI. I did however have a lot of work done to that gun many years ago. I had the chambers lengthened, the forcing cone lengthened and the barrels back bored and professionally polished. I had the barrels cut to about 20" and threaded. At first I'd put a turkey choke in one barrel and a modified choke in the other. My gun has 2 triggers, so I could choose which to fire first.
My thought was that if I had a bird very close, I'd use the modified and if he was out further I'd use the turkey choke. In all the years that I hunted actively with that gun, I never needed the modified choke, so now it has 2 turkey chokes with .650 exit diameters.
I also have sling swivel studs put on it and that makes it very easy to carry in and out of the woods.
The very positive thing about the Fox is that it fits me like no other gun I've ever shot. It's the only turkey gun that I own that I can leave in my lap and get it up to shoot a turkey. It's also a great sporting clays gun but no one wants to be around when I shoot it. It's way too loud!
Lastly, I would not make all those modifications to that gun today. There are many better and less expensive choices now and I'd rather have my intact Fox as it came from the factory.
Thanks,
Clark