RetiredMil wrote on Mar 15^th, 2019 at 4:14pm:

Is there any difference between the GI extractor and other 30-06 extractor on the market?

Pictures found at marketers like Midway and Brownell look much the same as the GI unit. Here's one "new" on e-Bay for $8, shipped -

  (You need to Loginhttps://i.ebayimg.com/thumbs/images/g/fdYAAOSwt4xadpo3/s-l225.jpg
  (You need to Login

I should add that the 30/06 case extractor's rim won't necessarily work with the bolt's extractor for cartridges with a different rim diameter (though it works fine on my Krags and Lee-Enfields). When it doesn't fit the bolt, just insert by hand and push out with a flat-ended steel or brass rod from the muzzle.