There are many businessmen in America who sell second hand firearms. In the past, when Hardy was with the Austrian gang, he used to buy second hand guns from Old Mike. Among the military supplies, firearms made up a large proportion millions of guns of various types.
There were also other goods, such as tents, uniforms, military vests, boots, typewriters, ice cream machines, ovens, mechanical spare parts, discarded tires, instruments, various special vehicles, production equipment, tools, drill bits, and cargo ships.
And so on and so forth.
Some businessmen would definitely be interested in certain goods.
Because they were cheap.
To quickly sell the goods, Hardy planned to mark up the prices slightly, maybe by just double, which would still be very, very low since the military's base prices were only one tenth or even one twentieth of the original production cost.