Looking to purchase Hudson M3A1 Grease Gun Model Replica Cap Fire

US Submachine gunner - M3A1 Full Set 3rd edition [Replica cap firing model gun].
You can check out the one I'm looking for, go to the below site and scroll down.

http://www.wwiireplicamovieguns.com/store/product_catalog.php?c=25

I'm having a hard time finding the Hudson M3A1 Grease Gun Model Replica Cap Fire

Thanks,
Bob