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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port reaming
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<blockquote data-quote="rpol98" data-source="post: 2937577" data-attributes="member: 122310"><p>if you have a drill press, vise, and some barrel blocks, you can do this yourself. it helps if you have a set of wire-gauge drill bits and a <s>hole</s> pin gauge set.</p><p></p><p>from high-school math, do the pi-r-squared thing to determine gas port cross-sectional area, and take a guess at how much percentage increase you want to open it up by, based on the nature of the undergassed symptoms from shooting a selection of your usual ammo.</p><p></p><p>my experience has been that this is an iterative process, because you don't want to go too big at the outset, you want to sort of creep up on the "just right" gas port size. I've used 10% to 15% gas flow CSA as a starting point, depending on type of symptom.</p><p></p><p>a 10% increase in drill bit diameter results in 21% increase in CSA. it increases as a squared factor.</p><p></p><p>a better gunsmith will give you a gas port that doesn't have a bunch of dingleberries hanging in the rifle bore.</p></blockquote><p></p>
[QUOTE="rpol98, post: 2937577, member: 122310"] if you have a drill press, vise, and some barrel blocks, you can do this yourself. it helps if you have a set of wire-gauge drill bits and a [S]hole[/S] pin gauge set. from high-school math, do the pi-r-squared thing to determine gas port cross-sectional area, and take a guess at how much percentage increase you want to open it up by, based on the nature of the undergassed symptoms from shooting a selection of your usual ammo. my experience has been that this is an iterative process, because you don't want to go too big at the outset, you want to sort of creep up on the "just right" gas port size. I've used 10% to 15% gas flow CSA as a starting point, depending on type of symptom. a 10% increase in drill bit diameter results in 21% increase in CSA. it increases as a squared factor. a better gunsmith will give you a gas port that doesn't have a bunch of dingleberries hanging in the rifle bore. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port reaming
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