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Wrong...Haenel's engineer was the original engineer (who holds the patent to the operating system design) on the HK416 program...then he went to Sig to create the 516 by making it more common with the AR platform and slightly improve on the op-rod design...knowing Sig they didn't really make much headway with the 516....then Caracal recruited the same engineer to make the 816A2...Caracal/Haenel is owned by the same UAE company...
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The patent stays with the employer. The engineer can only take his knowledge and experience with him to the other company. Haenel has to implement that knowledge without infringing other patents.
All in all it is in some aspects a better design than HK. The only thing HK was able to sue for patent infringement was the setup for the holes for the Over The Beach functionality, but which some legal experts claim is a void patent, as it has no uniqueness to it that would allow you patent it. So the chances, that HK's patent infringement claims will be thrown out by a court is a good possibility. This has happened in the past with HK too. They lost a pistol contract against Walther and sued for patent infriengement, but later lost due to the patent being void and Walther still got to deliver the pistols to the german police.
As far as I see, Haenel have made a nearly identical copy of HK, with some improvements, like being more Mil spec than HK, their gas release is supposed to be self regulating, tool-less handguard removal, replaceable steel latches for the charging handle hooks etc.. The did not just copy, but added some very smart features.
And their standard trigger is awesome. Plus the fact that Haenel has rifles on stock and is able to deliver at any time, while HK has failed to deliver to civilian customers for the last 2 years.
The Haenel is a valid alternative to HK, if not the better option.