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Bolt closing problems


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Anyone has them too?

 

I used to have shortstrokes a lot. Changed to a weaker spring problem solved. But not I have closing problems.

 

Bolt will fall short of closing just a little bid. Pulling trigger, trigger falls and of course nothing happens.

 

Funny thing is that it happens after 4 stages or so. No problems in the first 4 stages but then something like 1 in 3 or 4 rounds.

 

Its not a cleaning problem tested that. Gun is oiled. Not a problem of parts brushing each other either.

 

Only explanation I have is outside temperature as in the cellar it works in the morning it works too. However, no idea why a change in outside temperature of 10 to 15 degrees will cause that. So maybe something different all together.

 

Anyone having same issues?

 

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Dirty op rod piston dragging not returning fully into gas block

 

Thats what I thought too. So I am cleaning every 3 stages or so. Did clean it next stage it happened again. Did completely dismantel it in the hotel cleaned it and lubed it. First stage the next morning 30 to 40% not closing. Gun was completerly clean.

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Dirty op rod piston dragging not returning fully into gas block

 

Funny thing is I did test it for 150 rounds in our shooting cellar. No issues.

First 4 Stages in the morning. No issues

From the 5th to the 8th stage it got worse and worse although I cleaned it twice in between

Dismanteled it completely in the hotel, cleaned it lubed it and first stage next day as mentioned above 30 to 40% not closing.

 

Stopped the match.

 

On the way home stopped at our shooting cellar. Got the gun out of the car shot 50 rounds without issue.

Shot another 50 with 3 not closing.

 

No idea why but the temperature difference between the cellar and outdoor which is between 15 and 20 Celsius seems to make a big difference. No idea why tho. Maybe more gas in the cellar because colder and the bolt moving further back and in doing so giving more forward momentum???

 

My main problem is that with the standard spring I can maybe shoot 50 rounds before the gun is so dirty that it starts shortstroking. But no closing problems.

With the weaker spring no shortstroking whatsover but not closing after around 50 rounds at least outside.

 

So I would need a spring somewhere in between but that would only eliminate the symphtom but not the cause and I am completely lost on what the cause is exactly

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