Completed, compliant, HkParts trigger pack with HkParts hammer, sear, trigger, and trigger box.
All GTG, right? DO NOT WASTE YOUR MONEY ON AN HKPARTS TRIGGER BOX!!!! The MKE ejector won't fit in the channel without jamming. HkParts Sales solution to my problem was asking if I'd tried a German ejector. When I pointed out this trigger box was useless to me since I bought it specifically for my MKE parts, I was provided a link to the return policies. When I requested contact info for the manufacturer, crickets.
Get the RTG US trigger box.
Also, remember to order a non-drilled hammer strut and a semi-auto spring and bushing. You probably won't be able to remove the factory strut from the factory hammer and the US semi trigger boxes aren't set up to re-use your MKE semi-spring.
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MKE trigger pack above the HkParts box.
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Upside down MKE box on left, RTG box (a good copy AFAIK) upper right, and HkParts lower right.
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MKE trigger pack in pieces. HkParts TB
lower left. Note pinned MKE hammer/strut.
Attached FileRTG trigger box. Should've gotten this one to begin with. I did have to cut it to match the MKE box.
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