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Discussion Starter #1
A big hello to everyone on this site. I'm a newer member here but not new to firearms or to HK products. But my most recent purchase of an MP5K PDW has me trying to figure out a few things. I am looking at possibly picking up a new trigger group with the intention of getting an auto sear in the future. My question is if the trigger group that I have now will work or if I will need to get a different one. Here are a couple of pictures of the of I have now.





It's only a 2 position group in a 4 position housing 0,1,3,F. I was wondering if I needed to actually buy a 4 position group like this MP5K 4 Position Burst Trigger Group - HKPARTS.NET if I intend to go full auto in the future. And with the trigger pack linked with an auto sear in it would it actually do all 4 modes of firing? Thanks for the help. I'm having trouble finding this info anywhere else on the web.
 

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That trigger pack should fit in any housing, but will only fire semi auto. If you go with a metal housing, you will need a different selector lever than with a polymer housing. They levers are cheap. If you buy a housing, go ahead and get one that is "clipped and pinned". If you intend to go full auto in the future, the legal way is to purchase a registered sear for approx 15K. Your gun will need to have the correct bolt carrier.
 

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Your trigger pack is neutered for semiauto only. It would have to be reworked and you'd have to get a new hammer, etc. It's best to buy one in a pack since the price is normally about the same or have someone install it in a pack for you.
 

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Discussion Starter #4
I have a FA bolt carrier in the gun and it is already clipped and pinned. I configured it this way with the intention of going FA. And this will likely end up a 3 stamp gun so even more fun and paperwork. I just don't know many specifics about the trigger packs and what can be used with what parts. But it sounds like I should just use that trigger pack until I'm searching for the go fast parts. Thanks for the quick responses.
 

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I just don't know many specifics about the trigger packs and what can be used with what parts. But it sounds like I should just use that trigger pack until I'm searching for the go fast parts.
Most sears these days are found already installed in packs. Its generally easier to convert a FA pack to accept the conversions sear, than unmodify a sem-only pack.

If you do find a bare sear, figure 400ish to put into a SEF, and closer to a grand for a burst pack.

You will want to keep your semi pack anyway because you'll be swapping the sear pack between hosts and its less frustrating to just put the semi pack back on the host than to convert two packs to new ejectors & springs every time you make a swap.
 

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You will want to keep your semi pack anyway because you'll be swapping the sear pack between hosts and its less frustrating to just put the semi pack back on the host than to convert two packs to new ejectors & springs every time you make a swap.
Better yet, just keep two packs permenately installed in two seperate housings, as a clipped and pinned housing generally does not cost very much. I do agree, better not to modify the existing pack.
 
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