Hudson H9 Parts: There is no secret stash "in the back" not listed on the website.

KE Arms LLC produced slides and H9A aluminum grip frames for the Hudson Manufacturing H9.

Hudson went bankrupt after announcing the H9A Aluminum frame version that would be both less expensive and lighter than the original H9 before the H9A was ready to ship.  This made sales of H9s grind to a halt with hundreds of guns still in manufacturing process and in inventory at distributors.

Hudson Manufacturing left KE Arms LLC and other subcontractors unpaid for thousands to hundreds of thousands of dollars worth of product produced.

KE Arms LLC never produced any other parts for the Hudson H9.  

KE Arms LLC never had any inventory of barrels, recoil springs, or internals for the Hudson H9.

Cambridge Manufacturing and a number of other manufacturers made all these other subcomponents. For a time they sold them through HudsonGunParts.com

Hudson's creditors, including KE Arms LLC, were unable to get any other parts from Hudson as part of their bankruptcy trial.

Daniel Defense bought the H9 design and spent years re-engineering it to release a new H9 pistol that has almost no parts in common with the original H9.  

Your H9 is now a collectors piece.  The parts are not replaceable unless Daniel Defense decides to make more to service and support original H9s.