flgunguy

Need help on HK sear burst pack

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18 posts in this topic

So I just got my F4 approval and I go to take out the trigger box from the pack. The part inside that aligns the selector lever got out of alignment somehow and now I fear I may need to bring it to a gunsmith to put back together. Here are a few pictures. Anyone know a qualified person for this in South Florida? Photo-Feb-10-5-41-05-PM.jpg

Edited by flgunguy
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Howdy - Likely an issue with the compression rod out of alignment - very common problem and thank you for stopping and asking before breaking it :)

Does this picture help? 

 

Carefully realign the compression rod/spring to be flat against the frame and not canted like you see on the NO section. 

 

Let me know if this helps

 

 

 

20210210_153711.jpg

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Yes I just did that and stuck the trigger box back in the pack. This part seems to move out of place easily, is this normal? Photo-Feb-10-8-58-29-PM.jpgPhoto-Feb-10-8-58-38-PM.jpgPhoto-Feb-10-9-00-01-PM.jpg

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Looks like you are good to go!

Yes the compression rod pops out like that often. Good luck finding a replacement if it breaks, I have an out of commission burst pack with that exact issue. :(, Thankfully I have 3 others :)

Other good trick is to depress the takedown lever while re-inserting the selector so the little metal catch piece doesn't bend/scrape your selector. The selectors should pop together easily. 

 

Enjoy your new investment! Now you just need the SD, MP5, MP5k, MP5kPWD, and briefcase to go with it. 

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Thank you, I was worried that somehow that thing popping out of alignment messed up the 3rd burst timing. I've got 3 9mm hosts now, just been waiting for this to clear. 

I read that parts for the ambi 3rd burst pack are hard to come by. I can just always get a more common SEF trigger pack and housing, and transfer the sear into it if some part breaks and I can't replace it right?

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@Spartan , good on ya for stopping in here to help with good detailed info. These types of posts ( with pictures and quality info) are the kind that help gun owners forever.... when they get on the Google and find forums like this.

Aaron - Mohnton, Pa

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  Aaron - Mohnton, Pa  |  BeltFeds.Com, LLC / Stryker Defense  |  FFL 07 / 02 SOT 

  Email: Sales@BeltFeds.Com      Phone: 610-983-8257      Website:  https://BeltFeds.Com 

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@flgunguy , I have always just ran SEF packs... to each their own, burst packs are awesome.. but these SEF packs are simple and easy. To answer your question,  If you have a registered sear it can be put in a SEF pack

Aaron - Mohnton, Pa

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Edited by Aaron in Mohnton Pa

  Aaron - Mohnton, Pa  |  BeltFeds.Com, LLC / Stryker Defense  |  FFL 07 / 02 SOT 

  Email: Sales@BeltFeds.Com      Phone: 610-983-8257      Website:  https://BeltFeds.Com 

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Just got back from the MP5 and UMP Armorers class in VA so happy to share the tricks I learned from Bob. 

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Tried looking on hkparts, numrich, apex, etc for spare SEF packs and housings but nothing is available. Would be nice to have a spare that I just can stick the sear into and go.

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Try GunBroker.com, they pop up once in a while. 

I have a burst pack in mine. Haven't shoot it yet. Keeping my original SEF just in case. 

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Robertrtg.com has what you need at the lowest prices.   Burst pack manuals are also available.  Honestly moving the sears around is more difficult than putting the burst pack together IMO.  I think most burst pack parts are broken by people loosing parts and forcing them together, not from wear.  I have mostly burst packs at this point, but I don't move a lot of stuff around.  By far SEF packs are nearly idiot proof, easy to clean, and hands down best for shooters.

Something you should know is that you don't just pop out  a registered friction sear and insert it into a new trigger pack.  Trigger packs need significant modifications to allow  a friction sear to work properly.  Some say there are potential legal issues with owning one sear and multiple "sear ready" trigger packs.  Some good info on the pages at HKpro.com.   There is/was a page on how to insert the selector levers back into a burst pack and there are utube videos that help as well.  Whenever you remove the left selector lever from a burst pack the wheel always goes cattywampus, and as you reinsert it with the lever at the 12 o'clock position you want to wiggle it as you insert it to bring the wheel back to center as the lever slides back through the wheel.   HTH

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I checked RTG but almost everything is sold out. I see a clipped and pinned SEF grip frame on gunbroker, but no corresponding trigger box complete with parts.

The search is on...

 

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12 hours ago, flgunguy said:

Yes I just did that and stuck the trigger box back in the pack. This part seems to move out of place easily, is this normal? 

Yes...completely normal in my experience with multiple sears / 4-position packs.  Once the selector is removed...the ratchet wheel kinda "floats," but will go right back into proper position when the selector is re-inserted.

Good luck and enjoy...

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Thank you very much everyone. Spartan those were great pics you sent!

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IMHO, burst packs look cool, but the simplicity of an SEF pack is hard to beat for most users.

I was never really a fan of HK burst packs until running one on 21e/23e - now I appreciate their usefulness.

 

The article below has links to videos on assembly/disassembly 

https://www.hkpro.com/threads/ah-the-joy-of-burst-pack-reassembly.475100/ 

 

The article contains a humorous quote from the author that is dead-on ...

  " It only took me five (5) days to reassemble the pack.  This is a pure trial and error learning experience.

    All I can say is that the designers of these burst pack were true sadists and children of the devil."

  "

That being said,  when burst packs fail, it is usually the compression rod.
FWIW, the spares I keep on hand for burst pack:

  - compression rod

  - compression rod spring

  - ejector levers (cal specific)

  - ejector lever spring (easy to loose)

  - ejector lever pin (also easy to loose, lol)

  - rifle hammer spring

  + complete spare burst pack

 

 

Good luck!

-- Matt

 

Edited by mattnh

-- Matt

 

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I'd love to find some spares for the burst pack but I do not see anything available online. So that is why I posted a WTB for the complete sear ready SEF pack in housing as a backup in case something on my burst pack breaks.

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I was looking for a spare compression rod.. and couldn't find any in stock.  All I could find are airsoft versions.

I think Spartan needs one for one of his broken trigger packs.

Edited by Ryo

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Everything ran great when I finally got a chance to go to the range, thanks for the help everyone!

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