My favorite Ansley H. Fox 20-gauge is a 6 pound 3 ounce, 1913-vintage A-Grade, with 28-inch Krupp barrels, and the circumference of its standard half-pistol grip is exactly 4 inches. Four additional Fox 20s in my collection are all within 1/16 inch of 4 inches in circumference, even a heavy 30-inch barrel AE-Grade. My Launch Edition, straight-grip, RBL-20, also has 28-inch barrels and weighs 6 pounds 3 ounces. However, its grip is 4 9/16 inch in circumference. My RBL-28 is 4 7/16 in circumference while both my RBL-16 and my light frame RBL-12 have grips 4 3/4 inch in circumference. The grip of my 9 pound 12-gauge, 3-inch, Fox-Sterlingworth Wildfowl is only 4 5/8 inch in circumference. My largest Fox grip is on a 1939-vintage Fox-Sterlingworth Brush with the drawbolt frame, and it is 4 3/4 inch in circumference.
A.H. Fox Gun Co. made some of their guns with a rounded off diamond shape cross-section to the grips which I find very pleasing. I don't have such a Fox, but my straight grip 1918-vintage 12-gauge Husqvarna No. 310 AS has such a grip that is 4 3/16 inch in circumference which I find very pleasant.
