Unique Design For Competition Use
External “Special Purpose” Choke Tubes made from high tensile strength e.d.t. 150 carbon steel to withstand the higher pressures created by large shot and the constant pounding of competitive shooting without bulging at the threads or splitting the barrel. If a tube does fail, simply remove and replace with another. Turkey Tubes deliver extra tight patterns when used with heavier charges of large size lead shot. Not for use with steel shot!
Big Book Catalog, Issue:71, Page:199