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Old 06-26-2007, 11:47 AM   #11 (permalink)
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Don't know your gun ... But "IF" anything like a PPS Blazer ?
The bolt does enter the barrel prior to firing to achieve a better seal. Likely whats happening is the O.D. of bolt is @ the SAME I.D. as your barrel, when there is a temperature difference, that has one part either expanding or contracting a tad more than the other your clearance opens up and bolt does not stick.

What I have done for my PPS Blazer bolt to prevent this when using small bore barrels, was to slightly turn down the diameter at the barrel end of bolt.

The length of the turned down portion was ONLY the distance bolt enters
barrel and NO more !!

Hosted image: Click on it.

Note turned down area at barrel end of bolt with 3rd seal ring.
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Old 06-26-2007, 12:11 PM   #12 (permalink)
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If it were like a Blazer, you would be spot on.

I don't think the Mag bolt enters the barrel much, but regardless it is doing it with and without the barrel. I think is almost has to be a weak spring.

Thanks for the help, though.
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Old 06-26-2007, 12:59 PM   #13 (permalink)
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mag bolt enters the barrel about 2 inches... since the breech is part of the bolt

I had certain barrels that would work with my mag, and ones that didnt. Got some 2000 grit sand paper and some water to solve that in the aluminum ones, my old brass had no issue (other than being way too ported and heavy as all hell)
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Old 06-26-2007, 01:32 PM   #14 (permalink)
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Haven't played with a mag much lately, but IIRC belive it or not to MUCH oil is about as bad as no oil. I think Tom's statement was "3 drops, no more".
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Old 06-26-2007, 01:39 PM   #15 (permalink)
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[QUOTE=Azzy;169217]mag bolt enters the barrel about 2 inches... since the breech is part of the bolt [QUOTE]


On a standard Mag, I agree. This is a MicroMag from PTP, I don't believe it enters the barrel very much. I could be wrong, but it sure doesn't appear to. I will take the gun and dry up some of the oil and see if it helps any.

Thanks again.
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Old 06-26-2007, 10:25 PM   #16 (permalink)
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Quote:
Originally Posted by Azzy View Post
mag bolt enters the barrel about 2 inches... since the breech is part of the bolt

I had certain barrels that would work with my mag, and ones that didnt. Got some 2000 grit sand paper and some water to solve that in the aluminum ones, my old brass had no issue (other than being way too ported and heavy as all hell)
MicroMags use Cocker threaded barrels, not standard AGD twist locks, the bolt does not enter the barrel.
As I have not had the bolt stick problem, I can't shead any light on the subject.
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Old 06-27-2007, 06:58 PM   #17 (permalink)
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Could it be over tightening of the screw that holds the valve in? Overtightening can cause the body to bend just a bit and therefore cause it to stick.

Last edited by Ir0nExpress; 06-29-2007 at 08:56 PM.
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Old 06-27-2007, 09:38 PM   #18 (permalink)
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Haven't played with a mag much lately, but IIRC belive it or not to MUCH oil is about as bad as no oil. I think Tom's statement was "3 drops, no more".
IDK, if that is true I have always over oiled my mags, but whenever it leaks, I just pour some oil in the QD, air it up, shoot it and my leak is gone. I could see how excessive oil could create a seal between the bolt and the breech, however I have never seen an issue on my mag, possible due to the twist lock barrels, which are decently bigger than the bolt.
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