I hit the legit 20 " mark three years ago with a bit of a pump ( 20 and 3/8 ) , but my body wt had to be up to near 250 and I am a tad over 5'9" . I would look better 20-25 lbs lighter and a ripped 19" arm.
Howard * and old fart with 20" guns but a chunky waist line as well. Oh well at least I am honest hehe