Top of their page says this:
PROFESSIONAL GRADE WEAPONS SYSTEMS REQUIRING NO LUBE
MADE, OWNED and OPERATED in the U.S.A.
Kind of misleading because if you go to the "ABOUT" page it states this:
Patriot Ordnance Factory, Inc. is an American owned and operated small business. Our Manufacturing and R&D facilities are headquartered in Arizona. We specialize in the design, manufacture and marketing of AR style rifles, uppers, lowers and miscellaneous gun accessories.
G3 / HK-91 PARTS
All items are new, made on HK licensed tooling from Pakistan Ordnance Factories and J.L.D. Enterprises, Inc.
MP-5 / HK-94 PARTS
All items are new, made on HK licensed tooling from Pakistan Ordnance Factories.
http://www.pof-usa.com/about/about.htm
Sorry, I guess they do make parts in the US but not the HK parts.