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cody6510

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Posts posted by cody6510


  1. So I checked my block again, and was able to tell things were in allignment by rooming the adjustment screw and looking inside the block. This was with the block against the shoulder. 

     

    I figured I would try spacing the block off the shoulder and give it a try anyway.  I spaced the block about .025 off the shoulder and shot the gun today.  

     

    The problem still exists and the gun is functioning exactly how it was when the block was against the shoulder. 

     

    Any other thoughts? 


  2. 6 hours ago, TonytheTiger said:

    Try standard gas rings. I've had bad luck with the JP rings.

     

    I can try mil spec rings out tomorrow.  I will also take a second look at the block. Right now it is against the shoulder on the. barrel. I was assuming alignment was corrct based on the dimple. 


  3. First time post, I've been reading for a while now, but have yet to answer my question. I built a new rifle, but cannot get it to run for the life of me.

     

    The systems I've assembled contains the following:

    18" Criterion Barrel with a rifle length gas system

    Seekins Adjustable Block

    JP Low Mass Carrier

    BCM Bolt with JP enhanced rings installed

    JP Low mass buffer and spring

    AR Gold Trigger

     

    The problem I'm having is the carrier is not locking to the rear on an empty mag and will not pickup the next round in the magazine. I have tried various types of factory .223 ammo. When testing I adjusted the block as Seekins advised me to, 1/4 turn at a time. I ended up with the block wide open, 4 turns out, and was still experiencing issues. For what it's worth, the gun was not even fully extracting the case until I had a little over 2 turns in the block.

     

    I've double checked gas block and gas tube alignment, both of which appear to be in good order.

     

    I spoke to Criterion and they were great to deal with. Their suggestion was replace all the low mass components and Seekins block with mil spec components. They believe (as I recall) my issues are related to the gas pressure still being too high when the bolt is trying to unlock, therefore the extractor is forcefully ripping the case out of the chamber and slowing the bolt down. This very well could be the problem, but my question is how does everyone else get their guns to run with low mass components? If Criterion is correct, how do I correct the timing? The rifle is for 3 gun and I would prefer to stick with low mass. I've already came to grips with the idea that this build is going to get more expensive, I just want my gun to run.

     

    What suggestions/ideas does everyone have?

     

    Thanks for your help.

    Cody

     

     

     

     

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