T JACKSON, LONDON, 20 bore, round body, back action, rebounding hammer gun. Recently nitro proved Damascus with 2 3/4" chambers. Min wall left .028" right.032" choked IC/IC. Restocked 15 1/8" highly figured wood by Mark Crudgington, (son of English gun book author Ian Crudgington). Action has gone grey, furniture reblacked not long ago. 5lbs 6oz. A lovely small bore hammer - information re Mr. Jackson is included along with copies of his trade label.