50cal Drop In Barrel For Thompson Center Tc Hawken. The item “Green Mountain. 50cal Drop In Barrel For Thompson Center Tc Hawken near mint” is in sale since Wednesday, March 4, 2020. This item is in the category “Sporting Goods\Hunting\Vintage Hunting\Black Powder”. The seller is “browningautofive” and is located in Jeromesville, Ohio. This item can be shipped to United States.