I guess GB bars are like Carlton chain is here now. Lots of loops are still made here, but more Carlton chain is being made in China now as well. Alibaba lists Carlton chain and Carton is rebranded under WoodlandPro and lots of other names. Blount owns both Carlton and Oregon and they are HQ'd here in Portland, OR, but it is just a parent/shell company. They own companies that make stuff in the US, Canada, China, and Europe. There are still guys here at the Milwaukie, OR plant making Carlton chain, but I have to wonder how much of it is really made here any more, or if they are just pressing together China fab'd steel.
I looked into GB manufacturing in Oz a few years ago after they sold out, and I could not find anything solid on where they were shaping/forging, cutting or plating the steel and bars. Guys are working at some GB plants in Oz, doing something. Spray painting the bars? Packaging them? Or rolling steel and stamping them out? Hard to say what.
Sadly a lot of steel product companies in this area have moved manufacturing to China. Traeger pellet BBQ grills is a classic example. They were invented here by a family of German immigrants and built in a small town in Oregon (the state). They built up a brand name and had quality. Then they sold out and the manufacturing was all moved to China. All that is left here is the parent company, the sales force, and tech support. They used to have thick steel and were welded up. Now they are made from bolted together crappy thin steel. Look on the Traeger web site and there is a long story about the Oregon blacksmithing and pellet grill history but nothing about moving ops to China or that the boxes all say Made in China on them now. Similar to the Oregon (the company), Griffiths & Beerens, and Carlton web sites... tradition and history, but little on current facts. Built in deception at best.