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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port size
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<blockquote data-quote="bamban" data-source="post: 2866007" data-attributes="member: 17722"><p>I have both + and - , but not for this purpose. The gas port is not a critical dimension to a tight tolerance. Most likely the mass produced barrels are drilled, not reamed. Drilled holes may or may not be exactly round.</p><p></p><p>On the service rifle barrels I do, I drill with 2mm carbide, followed with 0.096 4 fluted carbide reamer. By CMP/NRA rulebook, service rifle legal barrels cannot have adjustable gas blocks.</p><p></p><p>I used to chamfer the inside hole. Not doing the chamferring any longer.</p></blockquote><p></p>
[QUOTE="bamban, post: 2866007, member: 17722"] I have both + and - , but not for this purpose. The gas port is not a critical dimension to a tight tolerance. Most likely the mass produced barrels are drilled, not reamed. Drilled holes may or may not be exactly round. On the service rifle barrels I do, I drill with 2mm carbide, followed with 0.096 4 fluted carbide reamer. By CMP/NRA rulebook, service rifle legal barrels cannot have adjustable gas blocks. I used to chamfer the inside hole. Not doing the chamferring any longer. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port size
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