Muzzle Diameter is 6"
Breech Diameter is 9.5"
Trunnion center to face of muzzle is 39.58"
Over all length from muzzle to casable is 72.7"

from "Artillery for the Land Service of the United States 1849-1865" Field Artillery-I, by Don Lutz.

Published by: Antique Ordnance Publishers

3611 Old Farm Lane

Port Huron, MI. 48060.