Hiperfire bursting a lot

[waktasz]

Seems whenever I try to shoot "fast" I reset the trigger in some weird way that makes it burst. Never happens when shooting hard shots or steel, only when trying to rip fast splits.  Never ever had this issue with any of my AR's, even with 1 pound triggers.

 

I assume the answer is to "hold it tighter" but I'm not sure if that's it. It's something with my trigger finger. 
 

 

[TeedOff]

Check your disconnector and disconnector spring for damage.


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[1981Shooter]

The ATF cameo 

[Sarge]

I guess my question is why weren’t you stopped? The gun obviously going full auto. 

  As an aside how did you get a NPM on a target that was still exposed?

[George16]

Check for brass shaving between the disconnector and sear. It happened to me before and when I took apart my MPX for cleaning, there were brass shavings between these areas. I sprayed it with chlorine free brake parts cleaner and blow it dry using my air compressor and everything work normally after that.

 

It has now become part of my cleaning regimen to do this process and so far I haven’t experienced it again.

[fbzero]

The first place to start is to look for damage on any of the trigger components and ensure correct installation.

If no issues are found there and you are using the heaviest springs that gives the lightest trigger pull, you may try going for the medium springs.  I had the same thing happening and it seemed to be a combo of not fully releasing the trigger and recoil when using my ultralight 3gun upper, which has a bit more recoil than my normal one.  Since swapping for medium springs, it hasn't happened again.

[RexKramer]

 

That ATF cameo was brilliant.

[waktasz]

15 minutes ago, fbzero said:

The first place to start is to look for damage on any of the trigger components and ensure correct installation.

If no issues are found there and you are using the heaviest springs that gives the lightest trigger pull, you may try going for the medium springs.  I had the same thing happening and it seemed to be a combo of not fully releasing the trigger and recoil when using my ultralight 3gun upper, which has a bit more recoil than my normal one.  Since swapping for medium springs, it hasn't happened again.

 

Definitely going to do the heavier springs...although I can't find them at the moment

[waktasz]

1 hour ago, Sarge said:

I guess my question is why weren’t you stopped? The gun obviously going full auto. 

  As an aside how did you get a NPM on a target that was still exposed?

 

It's definitely a technique issue, not an unsafe gun but yea, it's questionable and an issue I need to fix. All the targets had all those hits on it, mostly A's 

 

The NPM target only had half of the upper A available. 

[Bwillis]

Are you using the mbx short stroke kit?

 

Try switching the buffers inner from the red spring to the blue spring. 

 

hiperfires have zero takeup, they are instantly at the wall if you hold your finger in the correct place and mouse click it creates a bump fire.. hiperfire are the easiest trigger to do this with.

[waktasz]

I took the whole trigger apart and I think it's the disco spring causing the issue now. It's all mangled. 

[waktasz]

[mpom]

2 hours ago, waktasz said:

???

[RaylanGivens]

22 hours ago, waktasz said:

Seems whenever I try to shoot "fast" I reset the trigger in some weird way that makes it burst. Never happens when shooting hard shots or steel, only when trying to rip fast splits.  Never ever had this issue with any of my AR's, even with 1 pound triggers.

 

I assume the answer is to "hold it tighter" but I'm not sure if that's it. It's something with my trigger finger.

 

Was this a brand new trigger?

 

I had the exact same problem with a Hiperfire Eclipse that had a several thousand rounds on it...  All of a sudden it started burst/bump firing just like yours...  I called Hiperfire...  No solution...

 

Edited November 25, 2019 by RaylanGivens

[waktasz]

Brand new gun with a brand new trigger in it. I bought it from MBX set up like this. 

 

 

1 hour ago, mpom said:

???

 

That's the disconnector spring

[WhiteDingo]

Before switching to the HPTA (from an EDT-SF) in an MPX, it would eat disconnector springs fairly regularly (500-700 rounds they were toast). With the springs installed for the slightly heavier trigger pull in a Hiperfire HPTA, going on 12,000 rounds with the same trigger parts.

Not apples to apples, but maybe useful info.

[waktasz]

The heavier trigger pull means lighter toggle springs, right? That seems like more bolt velocity and damage, but thats what I installed today so we'll see.

 

[WhiteDingo]

8 hours ago, waktasz said:

The heavier trigger pull means lighter toggle springs, right? That seems like more bolt velocity and damage, but thats what I installed today so we'll see.

 

 

Right. It seems backwards.

[Nolan]

I think when the hammer goes all the way back, the booster spring mechanism goes over-center and with the heavier springs (lighter trigger pull) the hammer then hits the disconnector & spring harder.  With the lighter springs, the booster spring mechanism isn't pulled over-center as hard and so doesn't hit the disconnector as hard.

 

I've been experimenting with a piece of butyl rubber inside the disconnector spring similar to the piece of rubber in an AR extractor spring.  So far (800 rounds) the disconnector spring looks like new.  Too soon to tell, but generally by now the spring would have been slightly deformed.

 

Nolan

[mveto]

My brother and I both had the same issue with the Hiperfire 24c when we were using them. It seemed whenever we tried to push the speed it would burst. Even if I tried to bump fire it, it wouldn’t burst. Ended up selling them after my brother had it burst on him 3 times during a match. I am currently using the CMC PCC trigger and so far it’s been much better.

[MoRivera]

On 11/24/2019 at 5:15 PM, waktasz said:

I took the whole trigger apart and I think it's the disco spring causing the issue now. It's all mangled. 

 

That'll do it.  I had a disco spring wear out on a trigger group....a Rise Armament IIRC...and it went full auto for a 3-4 rounds every now and then.

[RaylanGivens]

@MoRivera @waktasz

 

Did either of you talk to HiperFire support?  I did and they never mentioned the disconnector spring.

 

Curious if they would send out a new disconnector spring...  Or at least sell you a couple...  I'd hate to have to make the trigger heavier just to get it to run without bursting.

 

[waktasz]

Just talked to them not too long ago. They are sending me some spares. Hopefully this next one lasts A LOT longer

 

[travail]

Thanks for sharing, mine just started going into fun mode at the last match. Will take it apart to see if I'm having the same spring issue.

[TeedOff]

[mention=69803]MoRivera[/mention] [mention=4477]waktasz[/mention]
 
Did either of you talk to HiperFire support?  I did and they never mentioned the disconnector spring.
 
Curious if they would send out a new disconnector spring...  Or at least sell you a couple...  I'd hate to have to make the trigger heavier just to get it to run without bursting.
 

I had the same problem early this year. I spoke with hiperfire and they immediately sent me a disconnector and disconnector spring. That resolved it for me.


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