Portugal loved the Steyr Mannlicher designs, but it was too much per unit cost.
Designing their own bolt cut out the designer royalties.
DWM must have owed them a favor, or a lawsuit settlement.
Sort of like the American car manufactures saying seat belts were a bad idea, until the Volvo gave the patent up for all to use.
Springfield 1903 is a good example of trying to circumvent patents.