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Someone please correct me if I’m wrong, the .035 gas port is for the 10.4” barrel?
 

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I’ll take one
 

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I don't know on the 10.4 (I have a non-vented GB) but I DO know on the M27IAR the vent is 1.4 and the gas block port is 1.7. Marine303 could chime in here if I'm wrong but that's what I measured.
 

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Discussion Starter #18
I don't know on the 10.4 (I have a non-vented GB) but I DO know on the M27IAR the vent is 1.4 and the gas block port is 1.7. Marine303 could chime in here if I'm wrong but that's what I measured.
The gasport hole in the M27 barrel that I am using for a reference is 1.3mm or .0511"
I don't have a reliable diameter for the gasblock vent
 
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