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Posted: 2/10/2013 2:39:50 PM EDT
| What is the correct way to align your gas block. I was at the range today with a newly built rifle and it was not fully cycling so I took a look down the length of the barrel after clearing it to make sure that the gas block was on straight and it looked slightly off to the right. So before I redo it I figured I would ask the hive to make sure I'm not forgetting something |
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Okay, upon further inspection I believe I fixed the problem but let me run it by y'all. Originally my low profile gas block (all parts are BCM) was pushed all the way back against the barrel shoulder (that's what I've always called it). There should be a very small gap there right?
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Quoted:
Okay, upon further inspection I believe I fixed the problem but let me run it by y'all. Originally my low profile gas block (all parts are BCM) was pushed all the way back against the barrel shoulder (that's what I've always called it). There should be a very small gap there right? Yes and no... That very small gap is to account for the thickness of a hand guard cap, very thin. The hole in the bottom of the gas block for most, is larger than a normal gas port hole by a margin greater than the thickness of a hand guard end cap. So, if everything else is on par, you can snug the gas block up against the journal shoulder and still get plenty of impulse gas to cycle the weapon. In the event there is tolerance stacking, this may not be the case. The gas port hole in the barrel can be slightly undersized requiring you to more closely line up block with gas port hole. If you have to be that precise with the block, your gas port hole may be slightly undersized to begin with, or there is other issues. |
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Get a piece of tubing that will snugly fit your gas tube in the receiver, and blow on it while moving your gas block around you will hear and feel the difference.Once you have located the optimum postion tighten one of the set screws, and test again to make sure you have flow.I then red loctite the next set screw tighten and then remove and loctite the first and tighten.
Second, buy a dimple jig that will work with any troy or vltor low profile gas block, or in the first method after tightening take a punch and mark the second hole and then dimple that. It's all very easy, I use to measure it out and mark my barrel, but blowing thru the tube is about as effective as you can get. |
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