SL8 Fire failure

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spirit

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Hi!

I got miss fire.

It's seem my firing pine did not hit with enough force the cartridge. I can see the punch mark but the amunition did not get fired.

The bolt and the pin are very clean and lubrificated. Maybe it's the hammer spring...???

Last week I have shoot more than one undred rounds without any problems but suddenly, I got this problem...

Anyone ever experiment this before?

Thank You!
 
Is this a one time event or did you have several misfires? There are a number of reasons one can think of for recurring misfires but a spring does not go bad so suddenly. It could be that the round was not all the way in the chamber when the firing pin hit it, or a particularly hard primer cup or a bad primer. Did the round fire on second attempt? As for the firing pin being lubricated, is this recommended for the SL8? With most other rifles, and handguns for that matter, a dry firing pin channel is the normal operational state so that firing residue does not accumulate and gum up.
 
The SL8 has a floating firing pin, so no spring.

First try some different ammo if you can.

If that's not it, check that the BCG is clean and working, and check that the hammer is still tensioned with both springs and snaps with sufficient force.
 
I have check the hammer springs.

If I start pushing back from is released position the hammer, I did not feel a real resistance from the spring until the hammer is fully vertical. I mean, I can turn it 30 degrees before I can feel a good resistance. (I hope my explainations are clear... lolol)

Is it normal?

If I shake my pistol grip rapidly the hammer is so loose I can hear it "clapping". The Right Hammer Spring move freely on the axis when the hammer is in release position.
I can push back the spring a quarter inche with my finger before I get any resistance...

I think the problem coming from the spring.

Badly HKParts.net did not have in stock the right spring. :( Anyon know a place where I can buy a spring kit?

Thank you !
 
The right hammer spring is your problem then.

Before you try to buy a new spring, the spring probably isn't broken, it's a pretty simple device, and very sturdy. It should hold tension between a little catch on the hammer, and the bar in the lower that goes across the bolt hold-open.

The best thing to do is take the hammer and springs out completely and put them back in properly. You'll be able to see if the spring is broken, rather than just not correctly installed, then worry about finding a replacement spring.

If you want some pics to help you take apart and reassemble your hammer, there's some pretty good images here: http://bit.ly/e9bbtP

Sounds like you've found the problem, next step is to fix it, which is the easy part :)
 
1) Don't ride the charging handle
2) Don't use Winchester 55gr silvertips (though I may be a little general here, might have been the batch I had). I got 5 misfires in the same box, switched to AE tactical and haven't had one in 100 rounds.
 
I can confirm hammer springs are correctly install and are not broken. If I compare with the link you post and all other page about that.

Spring did not keep tension all the way... I really think I need new ones. :(
 
I have install a used Right Hammer Spring from Wolverine... They only have used. Thanks to Mr. Hipwell. :)

But the problem persist. I have also clean and polish the Firing Pin, but no chance. The pin hit the cartrige but the bullet "Did Not Fly". Sometime I can shot 58 times without any problem and sometime after 10 shots it happen.

I don't know what to think anymore...
 
Where are you located, maybe someone with another SL8 can bring theirs over and you could compare/troubleshoot the issue. Or you can try putting the internals back into the SL8 lower and see if that works. Which version of g36 lower do you have? FBI? Navy? SEF?
 
This is one of those problems that's going to be hard to figure out without taking a look at the rifle.

If you're not able to figure it out on your own, I'd recommend taking it to a gunsmith.
 
Last thing I can think to try....if you have the proper tension on your hammer springs from assembling it properly (should be fairly obvious, should release with some force when you pull the trigger on the separated lower), it might be worth checking that the BCG is correctly cocking the hammer each time. If you pull the trigger and it feels mushy, makes no click, no bodies are slayed, then there's a good chance your BCG isn't resetting the hammer.

Either way, the best thing to do is double and triple check that everything is put together properly, and test each part of the firing function from BCG resetting the hammer to the hammer striking the firing pin with sufficient force, to the firing pin protruding far enough from the bolt face to fire the primer.
 
It's a FBI lower...

I can feel the hammer is released when I pull the trigger. But I will check again. The pin it but no firering... When I look to the shell I can see the pin did not hit very hard the shell...
 
I am not sure what to think. I really need to see it to even guess at this point. Can you take a pic of the installed trigger parts in the FBI housing?
Did you "level" the FBI housing or modify it in any way?
 
spirit said:
I have install a used Right Hammer Spring from Wolverine... They only have used. Thanks to Mr. Hipwell. :)

But the problem persist. I have also clean and polish the Firing Pin, but no chance. The pin hit the cartrige but the bullet "Did Not Fly". Sometime I can shot 58 times without any problem and sometime after 10 shots it happen.

I don't know what to think anymore...
Click to expand...

I think you were shooting next to me at club de tir de Montreal last week.
 
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