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Posted: 2/2/2013 5:24:41 AM EDT
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Any tricks of the trade when it comes to making sure the gas block is properly seated over the barrel gas port? Is there any forgiveness (degrees off center)?
PSA mid length, .750 barrel with a Troy .750 low profile gas block. |
| I use a ~6" piece of blue masking tape and line up the long edge with the center of the barrel and gas port. Like it was mentioned earlier the gas block hole is slightly larger than the gas port itself. You want to make sure the gas tube runs the center of the barrel so it isn't skewed when it's in the upper receiver. That could cause a problem with the gas key. |
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Do you have and know how to use a set of calipers and feeler gauges?
Measure from the barrel shoulder to the center of the gas port. Measure from the back of the gas block to the center of the gas port. Now the hard part. Subtract. Use feeler gauges to space the gas block off the shoulder. I have seen them range from slam up against the shoulder to .050 off, so no particular measurement is written in stone. Eye-ball it for TDC and you are done. If you cannot eye-ball it close enough for TDC then get someone else to help you. |
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