Burst pack roller sear trip lever question
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Thread: Burst pack roller sear trip lever question

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    Default Burst pack roller sear trip lever question

    So I have this mp5 4 position burst pack that's not functioning properly. When the auto bolt carrier is all the way forward, it seems the sear trip lever isnt pushed down far enough to release the hammer. With a standard SEF lower installed, the trip releases the hammer.

    So, I'm looking to replace the trip lever. It seems all the places I could find are out of stock of all the burst specific roller sear trip levers. Would a standard roller sear trip work or am I just out of luck until they come back in stock? Thanks in advance!

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    What weapon is the burst pack installed on? Is the weapon and burst pack completely factory original? How about the bolt carrier, original and untouched also?
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    Quote Originally Posted by MG34_Dan View Post
    What weapon is the burst pack installed on? Is the weapon and burst pack completely factory original? How about the bolt carrier, original and untouched also?
    Trigger pack and bolt carrier are out of a pd trade in mp5, host gun is a registered receiver two push pin zenith post sample mg. Sef pack trips just fine. this burst pack, doesn't get pushed down far enough to trip

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    A standard roller trip will be fine. The newer burst trips are profiled to work with the 40cal and 10mm mp5

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    Please post some side-by-side pics of the burst pack and SEF pack showing the trip levers in relation to each other. That will tell the tale.

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    dakotasomm:

    Is the grip frame rock solid --- no movement up or down?

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    Let me look tomorrow. I thought the burst roller sears have an offset to clear the indexing cam, but I haven't had one apart in a while so I may be mis-remembering. Or these old-fashioned's may be causing too much brain fog. Either way, I think I have several of both styles. I'll strip down a burst pack over the weekend and find an exact match. Got a pic of the one YOU have?
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    Dave, I'll save you some agony; I just happen to have one stripped down...

    The Roller Burst Sear (Catch) is offset to clear the Eccentric Bushing that operates the Shifter Rod. The Burst Hammer's sear catch shelf is offset to allow room for the Eccentric; which both share the same axle pin. The Roller Trip Release Lever is specially arched for smooth operation of the Roller Sear (as shown below).

    Burst pack roller sear trip lever question-img_6282.jpg Burst pack roller sear trip lever question-img_6284.jpg Burst pack roller sear trip lever question-img_6286.jpg Burst pack roller sear trip lever question-img_6288.jpg

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    Got the new roller trip lever in today. That seems to have remedied the problem. However, the compression pin snapped as I was reinstalling it. That's my **** luck for ya. Anyone got leads for one? Got a wtb add up in the mp but they're out just about everywhere as well.


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    Quote Originally Posted by dakotastomm View Post
    Got the new roller trip lever in today. That seems to have remedied the problem. However, the compression pin snapped as I was reinstalling it. That's my **** luck for ya. Anyone got leads for one? Got a wtb add up in the mp but they're out just about everywhere as well.
    I got mine from HK Specialist -> https://www.hkspecialiststore.com/ It looks like they are out of stock there too.
    Here is my experience with replacing one. -> https://www.hkpro.com/forum/hk-nfa-t...eassembly.html
    dakotastomm likes this.

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